Sav-Sesh 

(Savages Session) A long violent struggle to extricate a hot load of shit from one's bowels, usually involving sweat, and commonly occuring in a porta-john.

"Full on gnar bruh, i think i just blew out my asshole in a nasty sav-sesh."

Sav-Sesh by mick_the_skin May 31, 2009