A synonym for blue jeans or Levi's. Brigham Young University (BYU) is owned by the Mormon church, which has very strict rules about chastity. A large number of BYU students regularly participate in Levi lovin' or dry humping, because they are trying to get it on without having real intercourse. So, in a sense, their jeans are protecting them from having sex.
Yeah, we were getting it on and I blew my load, but luckily I had on my BYU condom. I wonder if she noticed?