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The act of masturbating into a curtain.
Mostly done into somebody else's curtain, other than your own. You don't want your drapes all spunky now, do you.
John: dude, you split up with dat hoe yet?
Jack: nah, m8
John: dooo it faggot, give her the curtain wank treatment
by The Curtain Fucker August 14, 2011