Guy and Girl are in the shower talking to each other.
Guy: Let's drop the soap.
Girl: Let's do it!
Guy and Girl are in the shower talking to each other.
Guy: Let's drop the soap.
Girl: Let's do it!
Listen up, buttercup. "Dropping the soap" is like, a prison thing, ya know? It means bending over, and, well, you can figure out the rest, Einstein. The joke is that the girl wants to do the dirty with the guy. You probably should stick to eating grass.