There's a chant/cheer break in the middle of our fight song, where the original 30s/40s/50s lyrics say "Hail, Hail, The Gang's all here."
Sometime in the 50s/60s that got switched to "Give 'em hell, Give 'em hell, Go Horns Go!" and that's what most of the old folks will say.
But since the 70s at least, Texas students have chanted, during that break, "Give 'em hell, give 'em hell, make 'em eat shit."
And then of course when we're playing hated rival OU, it switches to "Give 'em hell, give 'em hell, OU sucks." You can hear this quite clearly on the TV broadcast every time the song is sung, which is after every Texas score and also after forced turnovers or other big plays.