Usually a BDSM term. Someone who enjoys physical pain and/or humiliation to great extremes; usually a submissive, but not in all cases. The word is generally applied to someone who 'can't get enough' pain and torture, similar to someone who enjoys promiscuous sex.
What I really need is a nice little painslut; all of my boyfriends have been pussies and even whined when I only whipped them.
by Aileen April 21, 2003
a masochistic role (see BDSM) wherein the role player achieves sexual gratification from experiencing varying levels of pain, usually at the hand(s) of a Master/Mistress.
That guy was such a pain slut that he was begging Me to punch him after I stomped on his balls.
by Sam I Am July 28, 2003