A Batterbomb refers to ejaculation. "Batter" is a shortened form of "baby batter" which is slang for male sperm. The "bomb" refers to its impact on a person's, preferably a woman's, face.

In the USA it's when you bust your nut in your hand and then slap the chick you just got done smashing. Preferably in the face but on the ass is acceptable.

Most commonly used in the UK and most of europe, a batter bomb is slang for a cum shot, or ejaculation load. It is only a true batter bomb if u catch the female in the face unexpectadly (sp)