Jonathan Ogden ... USC SUCKS. Here's Why

You ready for some USC Trojan condom jokes??

Well, here you go ... courtesy of one of the GREATEST football players of all time, Jonathan Ogden -- a very proud UCLA alum.

Big O was out in Houston when we asked how he felt about USC signing some of the best high school football players in the country this week.

Ogden wasn't happy about it ... and started GOING IN on the Trojans.