A couple from my youth…
“Smash em, crush em we don’t care!
There’s a hospital right over there (point to hospital near home field)!”
And my personal favorite, the cheer for my high school defense, short and sweet:
“Blood makes the grass grow. KILL! KILL!”
Also, our marching band had an electric bass. They had a mini-bleachers set up in one of the endzones, and when we were defending would seek to inspire us with Another One Bites the Dust, which was pretty cool. Nothing quite like breaking the defensive huddle for a goal line stand, and hearing that bass guy lay down the “BOMP BOMP BOMP” bit, crowd going nuts. Really made ya want to take somebody’s fucking head off. Ahh…youth.