Ever see a cat lick its ass? Then you know it's pretty damn fast.
When I heard my old man coming home right when I was in the middle of some afternoon delight with my next door neighbor, he gathered up his clothes, rock-hard dick and all, and jumped out the window faster than a cat can lick its ass.
Short for "The Heat Is On," which is the name of a song by Glenn
Most likely derived from the name of a short movie-type skit from Saturday Night Live, starring Ben Stiller, Jimmy Fallon, Horatio Sanz, and Will Ferrell as Glenn Frey. If you have not seen this skit, I highly recommend it -- it is absolutely hilarious!