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A sign indicating that the occupants of the room on the other side of the door are engaged in sexual activity.
Necktie hanging from a doorknob

(Older student): just to make sure, you do know what it means if you see a necktie hanging from the doorknob right?

(Younger student) Yep , it means sit quiet and wait ten minutes or so for you to finish.
by Rakis June 14, 2018
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