The name given to homosexual men that only allow themselves to be penetrated whilst laying on their side.
Mark advertised in the gay classifieds that he is a powerbottom, but his date discovered that he was in fact a lazy Sidebottom with a wollered out butthole.
To act of masturbating in every room in a building, normally your own home but schools and hospitals are adequote substitions. Points are scored for the amount of family members in the room and also how and where semen strikes them. Double points are awarded for danger wanking aside your sleeping parents and siblings.