emerge-ency
What a horny dude has at 2 a.m. when his tallywacker majorly "comes out of hiding" and he feels an overwhelming and super-urgent need to insert it into the love-tunnel of his bed-partner, even if she is fast asleep or otherwise not in the mood for hot 'n' wild copulation.
Exasperated girl: I don't get it --- it seems like all da guys I know often can't "get it up" prior to "lights out" in the evening, yet they then suddenly have a dire "emerge-ency" some time later, and wake me up at two in the morning, wanting to lulu!