Well the only chant we really do at my chapter is a generic one for ATΩ
Ruh Rah Rega!
Alpha Tau Omega!
Hip, Horrah!
Hip, Horrah!
Three cheers for Alpha Tau!
A! T! O!
(every chapter throws in it's own stuff at the end, and ours has always been this)
AWWWW, SUCK IT!
Yeah it's dumb, but it's great after a win in intermurals
as far as songs go, my favorite is our dirtiest
Rat shit bat shit, p*ssy don't smell,
c*ck sucker mofo Taus give 'em hell!
With a Cast-iron skillet and a Blue and Gold rod,
I'm a bad mofo I'm a Tau by God!
(this is obviously edited, we don't really say mofo

)
then we kill our drinks, no matter what or how much. When pledging I was always surprised how the girls thought this was funny instead of insulting or whatever.