Thanks to V for the find!
Per V: "This is from the second episode of Delta House, a TV spin-off/sequel to Animal House. The frat has to ensure their team wins the football game so they resort to cheating. In this case they cut part of the opposing team's kicker's pants so that when he goes to kick they rip, exposing his tighty whities and causing him to trip and miss the kick. It is a decent humiliation scene but I do wish the source was better. It is a 1979 TV show that has never been released on DVD."