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1.
Someone who will stick around or stop by just to steal your drink (usually water) and then quickly leave. Only to come back a few minutes after leaving you just for another until your drink is completely gone.
Friend 1: Hey mind if I drink some of your water before I go?
Friend 2: Sure
*5 minutes later*
Friend 1: Hey let me have some more of that water!

*drinks and then leaves*

Friend 3: Dude, she's such a water mooch!
by Ichirukio September 20, 2010