My money don't jiggle jiggle, it folds.
I want to see you wiggle wiggle, for sure.
Listen up, buttercup. The joke is about how this dude's money folds, not jiggles. It's funny because he's saying he wants to see someone "wiggle wiggle," probably meaning dance or shake their body. It's a playful way of asking someone to dance, see? It plays on the rhyme and rhythm and is considered funny.