"Swimming on the Cash" is a song sung by Ricky Bowers and Donny Dolphin in the Season 2 episode, "The Lucked-up St. Paddy's Day: Part 2 ". It's about Ricky and Donny imagining swimming in a pool of cash once they capture a leprechaun. The song parodies the song "Slippin' on the Ice" from Animaniacs, which in turn parodies the song "Singin' in the Rain".
Ricky & Donny: We're swimmin' on the cash.
Just swimmin' on the cash
So take off your worries and just relax.
Donny: Now we're bewitched.
Ricky: Because we're filthy rich.
Ricky & Donny: Just maxin' and relaxin' on the cash.