Click To Help Darkseid!
Darkseid has declared that this article requires immediate Cleanup in order to meet a higher standard.
Help improve this article by improving formatting, spelling and general layout - least it fall victim to an Omega Effect

Stop hand

Yop Yop!
~ Yaap Yaap's catchphrase and the only word he can say

Yaap Yaap was a creature who grew from a pimple on Billy's back after drinking Granny Grim's potion to heal his stomachache after eating too much junk food. He is the main antagonist of the The Grim Adventures of Billy and Mandy and Grim & Evil episode, "Billy's Growth Spurt". He makes his only appearance in that episode.

He was voiced by Richard Steven Horvitz.


He originally started out as a pair of eyeballs and a mouth, until Billy fed him and he grew more and more. With each growth spurt, he grew to resemble Billy more and more until he was strong enough to detach from him. He resembled Billy in appearance except he was very small, bald and naked.


He seems to be dimwitted then intended the only words he says is, "Yop Yop!" which he earned him that name, Yaap Yaap, from Billy.


Billy called him Yaap Yaap because that was all he could say. Mandy and Grim thought of a plan to get rid of him as he is wrecking Billy's kitchen, as well as being disgusted and annoyed beyond belief. Grim receives a potion from his grandma called Heebie Jeebie Juice to kill him. When Yaap Yaap sees this, he detaches from Billy and runs under the couch, and when Grim goes to retrieve him he bites him in the butt. Mandy tells Yaap Yaap that the potion is actually cherry soda with no natural ingredients, to which he excitedly gulps it all down. He then lets out a loud belch and melts away to a puddle of flesh. Billy is heartbroken because he is dead, and that he wanted the soda all to himself. Mandy sucks up Yaap Yaap's remains in a little vacuum cleaner and tells Billy to throw them away, and Billy considers it, but eats it instead and yells "Yop Yop!".


           Cartoon Network 2010 logo Villains

TV Series
Red Guy | I.R. Baboon | XANA | Scyphozoa | Men in Black | William Dunbar | The Announcer's Remote Control | Strike (OK K.O.! Let's be Heroes)

Tv Movie Villains

Dexter's Laboratory
Mandark | Quackor | Crazy Robot | Badaxtra | Hookocho | Lalavava | Comrade Red | Mental Mouse | Huntor | Peltra | Simion | Orgon Grindor | Dynomutt X-90

Foster's Home for Imaginary Friends
Terrence | Bendy | Berry | Kip Snip | Lil' Lincoln | Nemesis | Omnizot | World

Ed Edd n' Eddy
Kevin | Kanker Sisters | Eddy's Brother

Grim Adventures of Billy & Mandy
Grim | Mandy | Nergal | Eris | Bogeyman | Jack O' Lantern | Pinocchio | Geppetto | Cthulhu | Morg | Bunny | Delightful Reaper | Bun Bun | Pan-dora | Hoss Delgado | Hector Con Carne | General Reginald Skarr | Brain-Eating Meteor | Mask of the Beast | Lord Moldybutt | Major Doctor Ghastly | Lionel Van Helsing | Nancy Claus | Estroy | John Jack Daniel Torrance | Wiggy Jiggy Jed | Yaap Yaap | Triceratron | Clowns | Lord Pain | Professor Death Ray Eyes | New Mandy | Super Chicken | Dreadbots | Arachnotaur | Velma Green the Spider Queen |

Hi Hi Puffy AmiYumi
Axel & Rod Skidmark | Eldwin Blair | Mr. Darrell | Mr. Master | P.A.L. | Rumaki | Sauerkraut Malone |

Camp Lazlo
Edward Platypus | Ms. Mucus | Scoutmaster Lumpus | Edward's Brothers

My Gym Partner's a Monkey
Bobby Lion | Bull Sharkowski | Chad | Euripides Sharkowski | Larry Raccoon | Lola Llama | Possum Girl | Principal Wolverine | Rick Platypus | Mr. Cheetah | The Spiffies

Miss Endive | Gorgonzola | Reuben | Chestnut | Funjl | Meaches |

Johnny Test
Bling-Bling Boy | Mr. Mittens | Brain Freezer | Zizrar the Mole King | The Beekeeper | Dark Vegan | Bumper Randalls | Road Burn

We Bare Bears
Nom Nom | Dave (We Bare Bears) | Ralph (We Bare Bears) | Wolves (We Bare Bears) |

New Looney Tunes
Yosemite Sam | Ivana | Rhona Roundhouse | Carl the Grim Rabbit | Elmer Fudd | Marvin the Martian | King Thes|

Mighty Magiswords

The Life & times Juniper Lee

Over the Garden Wall
The Beast


Craig of The Creek
Carter Brown

Mao Mao: Heroes of Pure Heart
Orangusnake | Ramaraffe | Boss Hosstrich | Ratarang | Rufus | Reggie

Community content is available under CC-BY-SA unless otherwise noted.