Green’s Dictionary of Slang

(US campus) banishment from a dorm room overnight or temporarily while a roommate uses the room for sex; also v. use.

1989		J. Doyle College Sl. Dict. 🌐 sexile [Swarthmore] state of banishment from one’s room while one’s roommate is with his significant other.
2001		Eble Campus Sl. Fall 9: SEXILE – (sex + exile) exclusion from a dorm room overnight or temporarily so that a roommate may use the room for sex.
2006		(con. 1972) Jurgenson & Cea Circle of Six 192: The motel had one room, so I was sexiled to the outside steps.