The art of placing a person's head between your hands and smacking them on each side of the head simultaneously. Usually said person is one that is loathed or disliked entirely. Most recently debuted on the TV show "Don't Trust the B---- in Apartment 23" where Chloe threatens to give a smackwich to a co-worker.
Chloe - If anyone says anything else about Margerie, Brenda's getting a smackwich!
Brenda - *gasps*
Chloe - Brenda's head is the lunchmeat and my hands are the bread! *smack*
A snack that resembles a sandwich in terms of its construction (a carbohydrate wrapping around a tasty filling), but is small enough to be held in only one hand and eaten while the person is running. Must be compact and tidy enough to not cause a mess while being eaten. Not to be used as a meal substitute.
A female heroine addict, especially one that shows years of drug abuse in her appearance and behavior. She is missing many teeth, and the ones left are rotten as all hell. See also Crankwitch and Crackwitch.
Fucking smackwitch whore squatted and pissed right next to the minivan, with me and the kids sitting right there! Welcome to San Francisco kids.