The key to the Irish Car Bomb is to drink it very quickly before the Bailey's reacts with the acidity of the stout, causing it to curdle (essentially turning it into cheese). The result makes the cocktail very unpleasant to finish.
A sarcastic code between guys to describe a woman who is dressed provocatively or projects sexuality. The woman is usually prematurely described as "wanting to get fucked". Usually used figuratively to say she's "turning you on", or she's "hot", not that she literally wants to get fucked there on the spot.
A related code is N.T.G.F. which stands for "needs to get fucked". A slightly stronger description.