When too many gay men enter a single room, and the sexual tension is so overwhelming that the only way to relieve it is for them to "explode" onto each other.
Person 1: "What happened to this room? Its covered in semen."
Person 2: "Well last night, Cher was visiting and all the guys that came to see her couldn't help themselves."
Person 1: "Oh, so there was a fagsplosion here last night?"