Verb, transitive. The act of taping over a door latch (or the hole in the jamb's striker plate) to prevent the door from locking.
From http://www.urbandictionary.com/define.php?term=watergate :
From http://www.urbandictionary.com/define.php?term=watergate :
... This verb is named in honor of the Watergate scandal, where this behavior was exhibited.Who watergated the doors?