A sex move similar to a rim job, where the thumb of the left hand is inserted into the anus, while continuing to use the tongue. Not to be confused with a Nak Attack.
Wayne: Kate was so mad at Trent the other night, that she went over to Dexter's room and Zak Attacked him!
Kyle: What, a rim job wasn't enough?
(n.) The instance of a brutal raping; unwanted sexual advances
(v.) to rape; to sodomize; forcing oneself in a sexual manner on another (goes well with roofies)
While Craig was passed out on the futon, Chris thought it would be fun to zak attack him with a 10 inch dildo to wake him up.