Dirty Klaas Share definition Flag A person who pulls out his eyelashes and let’s his mom pick out his undies. Brian: That guy is such a momma’s boy.Steve: Yeah, he’s definitely a dirty Klaas. Dirty Klaas by marvelvous September 2, 2021 0 0 Get merch Get the Dirty Klaas mug. Buy Now — $32.95 See more merch