Trying to hide a boner, but failing and getting laughed at.
Steve; Look at Billy, he's got a Warren G. Hardon
Everyone laughs at Billy, who has a massive Warren G. Hardon
Getting an erection in public, trying to hide it, and failing horribly. Normally you try to play it cool but get embarrassed out of the room.
Earl: EVERYONE Juan has a Warren G. Hardon!!!!
Juan: what? No...
Everyone: HAHAHAHA Juan is stupid
Juan: I gotta go!