"Fingernails4Cash" is an advertisement jingle for the website Fingernails4Cash.com, a site that collects fingernails in exchange for little cash. The guys see it on TV at The Drunken Clam in "The Giggity Wife".

Lyrics
Salesman: Everyone has fingernails

and everyone wants cash

So send us all your fingernails

and we'll send you some cash

Fingernails4Cash.com, Fingernails4Cash

Remember, it's just fingernails

so don't expect much cash

Fingernails4Cash.com, our service never fails

Just take the cash and don't ask why we want your fingernails

Cause we might be building a fort with them