Grubby Grouper is a surfer fish who likes to hang out at Goo Lagoon.
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He only appeared in one episode in the season 2 episode "Bubble Buddy." He drove up to Pearl and her friends and shook Pearl's hand, who said "I'll never wash this hand again," but afterwards, SpongeBob came with Bubble Buddy and had Bubble Buddy shake her hand, cleaning it which in turn made her cry and become enemies with Bubble Buddy.