If I'm hearing this correctly, I think they're singing:
"We don't need no en-chill-la-das"
"We don't need no sauce control"
"No carne asada in the classroom"
"Waiters leave them chips alone"
"Hey! Waiters! Leave them chips alone!"
"All in all it's just another chip in the bowl"
"All in all you're just another chip in the bowl"
Watch the video and see what you think.