When one wacks off as quietly as possible so as to not disturb the people in the same room.
Sam: I hope no one notices I am stealth masterbating
Girl friend: Sam ... are you wacking off!!!!
Sam: Oh Shit!
by themanwiththeplan9192 April 3, 2010
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The act of whackin it very quietly, like when everyone is home or someone is right outside the room. Turn the volume down really low.
Yo man the other night I was so horny so I did some stealth mode masterbation.
by Trippinballs January 30, 2007
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