The male art of masturbating whilst perched upon the toilet taking a dump. Key words here are "Fap" (Masturbate) and of course "Shit". Also, the past pretense of shapping may be referred to as "To have just shame".
"Daaamn, did you hear about Rick in the bathroom?" "Nawh boss, what happened?" "He was taking the biggest shap in life!" "GROSSSSSS." AND "Bro, I think i just shame." :\