It was:
"P, O, K, E, Poke out their eyes." repeated several times.
It was obviously in jest, but got about 200 student section people chanting it for several games (NE endzone). At one game I remember an older couple (younger than I am now) turning around and glaring at us.
The chant was recycled for a couple BYU basketball games as well.
NOTE: We did NOT want anyone's eyes poked out and didn't condone violence between players or fans.