One who kisses a mom other than his own, usually of an acquaintance. The act is performed mostly spontaneously, in a steamy burst of passion. The doer is generally under the influence of alcohol, with only two shots away from being classified as a motherfucker.
1) An alternate to 'motherfucker' to the impersonal; more accurately directed at inanimate objects and situations, whereas motherfucker is generally reserved for person-to-person communications.
2) A dire situation or circumstance.
3) Short for 'the mother of all bitches'.