SIMP

S.I.M.P (Squirrels In My Pants) from Phineas and Ferb
The song is improvised when Candace passes by the group, struggling to get two squirrels out of her jeans.

Background singers: SIMP, squirrels in my pants!
Street Performer 1: That girl's got some serious squirrels in her pants.
Candace: There's squirrels in my pants!
Background singers: S to the I to the M to the P!