P.O.T.R. is abreviated for pebble on the road. a pebble on the road is a boy with a small sized penis.
Girl: "i wanna get all up in the boys pants"
Friend: " i don't know about that. I heard he has a p.o.t.r."
Friend: " i don't know about that. I heard he has a p.o.t.r."
by Britneyfarwell June 15, 2017