The act of getting a few willing friends or the whole class involved in fucking around with a substitute teacher.
Guy 1: Dude i heard there was a sub in history today.
Guy 2: Yeah dude. You ready for this Sub Fuck?
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Sub-Fuck. A term used to describe the act of having Anal either beside or behind an open Subway resturant.
Person 1: Wanna go out to dinner?
Person 2:No, but wanna Sub-Fuck?
Person 1:Sure!