He was voiced by Rob Paulsen.
Phlegmy Boy used to beat up and torture Snotty Boy when they were younger. For some reason, they have never seen each other for a long time.
Phlegmy Boy is even more sadistic and cruel than Snotty Boy and even plays with explosives. He also senselessly beat up Otis and his friends because they were happy (which he hated), so he probably bullies people and animals alike just for fun as opposed to any insecurities or past bad experiences. He is also a lot more intelligent, manipulative, and formidable than his younger cousin, who is just plain dumb. He has been seen tormenting a cat (presumably belonging to his aunt and uncle), showing that he is just as, if not even more, cruel towards animals than his cousin (also shown when he beat up Otis and his friends). He also manipulated his aunt Nora into thinking he was a “good boy” and looking the other way. He was also likely jealous of the fact that Nora even said that Snotty Boy was her "favorite". He ultimately got his comeuppance when he was dragged by the ear by Nora after tormenting Snotty Boy when she saw it.
Phlegmy Boy is only slightly less fat than Snotty Boy. His younger cousin wears braces whereas Phlegmy Boy wears a headpiece and retainer.
- He is the reason that Snotty Boy was mean the whole time.
- A former lieutenant colonel in the U.S army, he lead battalion of soldiers into numerous battles during Operation Desert Storm. He was considered dangerous and irrational, altough he was also considered brave and an effective leader.