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1.
A phrase friends shout at (A.) someone and their significant other or (B.) two people who belong together, usually really loudly and in an exceptionally embarrassing manner, reminding them to use condoms when they have sex (which is inevitable, or at least in the eyes of the person shouting it).
A.) When my boyfriend and I left together our friends shouted, "Use protection!" loud enough for anyone in a five mile radius to hear.

B.) When me and my best friend of the opposite sex left the party half the room screeched, "Use protection!"
by Light Up Socks January 13, 2011