The act of sexual intercourse - usually in a hap-hazard way, in secret, and without regard for anything much past the act itself. The connotation implies an a possibly dirty act purely for pleasure, possibly rushed, or done behind closed doors.
George wasn't at the golf course like he said he was but rather was schtooping his neighbor's wife.
The act of having a transsexual prostitute first stretch your scrotum, then insert both of your testes into your own anus using her/his penis, simultaneously vomiting into your open mouth while you strike him/her in the lower abdomen to induce involuntary defecation.
That tranny hooker was doing a great schlipping mah fronecks last night before I kicked her ass out of bed because her shit smelled like bad Taco Bell.