Geldon

Geldon is an evil black dragon that appeared in the episode "It Hits The Fan". It was summoned after the word "shit" was said enough times. However, it was re-banished by the Rune Stone of Undoing. While being sent back to to depths of hell it said, "Ah, dude, lame! Lame! Bummer, dude!" in Cartman's voice, to which Eric himself ironically proclaimed, "What a stupid voice!"