When politely asked or forced from one's room in order to create the private atmosphere most roommates need for coitus with their special friends. Incidentally, it is what I am right now.
Shit, It's 1 am and my roommate sexiled me. He's been goin' since 10 pm, don't I ever get to sleep?
The past-participle of the verb sexile.
To be banished from one's room (most often, a single-space dormitory room) so that the roommate may engage in private sexual intercourse. Generally speaking, sodomy, cunninglingus, fellatio, and most forms of foreplay consitute grounds for sexiling.
To be "exiled" or banished from the dorm while it is being used by a roommate wanting privacy for (often overnight) sexual activity.
It is a common phenomenon at college, often done willingly by arrangement, which may include telltale signs to show the room is being used (i.e. a strategically placed sock or tie). Where sexiling becomes too regular and inconsiderate, the solution is another Urban Dictionary favourite = Cockblocking.