An open hand slap in which the one assaulting has covered said hand with excrement. Usually reserved for conflicts in which one has a great deal of time and not a lot of dignity.
"No. Worse. His girlfriend's ex-boyfriend used their bathroom, and when he was in there he covered his hand in shit. Then, when he came out, he Shit Slapped Bob!"
when you go swimming with a person in an ocean/lake/wavepool. Swim in front of them and take a shit. the wave will carry the shit and slap the person behind you.
You: Goddamn man did you seriously just shit slap me???
A first cousin to the term "Jackson 5'ed', a Shit Slap is when you swipe your fingers through your own ass hole, then bitch slap another individual with your shit covered fingers leaving a rusty tire tread.
Damn Dude, I caught Karl punishing his penis so I shit slapped him until his face looked like a work fecal art.
Bill: That fucking chode pissed me off so much yesterday i gave him a Shanghai Shit Slap (SSS) and he cried. He smelt like shit for the rest of the day.