when a person who has been celibate for a long period of time has a strong and sudden burst of sexual energy, causing them to have irrational and/or poor judgement, therefore causing them to fuck someone he or she has previously had one or more sexual encounters with in the past. this is usually meaningless, mindless sex. it's similar to angry-sex with the throwing of objects, but with less obscure language (ie. cursing).
chris: yo did you hear that sarah was celibate for awhile?
josh: that slut? no way, dog!
chris: i know. but she had some relapse sex with her ex-boyfriend, who is also my roommate. i was in the room during. then the dude gave me a high-five.
by IHUNTCANDY July 30, 2009
Get the relapse sex mug.