Fuck-friend, usual sexual partner, girlfriend, shag.
В пятницу вечером забухали с корешем, потом появились бабы — одна его поебушка, другая ее подружка.
Friday evening we were drinking with a mate, later chicks turned up, one his sex friend, the other her friend.
(Юрий @ 0pk.ru, 11/2011)