The action of jabbing your thumbnail into another's arm. Depending on boniness of the finger and fingernail length, the doom finger can be VERY painful! Especially when done repeatedly. The user makes a fist with the thumb sticking out over the index, much like a knuckle sandwich but the thumb instead.
by Hazard89 April 17, 2011
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Get the doom giant mug.A sex position in which the "witch" straddles the "broom" until the white demons "come" to destroy her. Can be cosplay or simply for fun. Also the name of the gay fanfic of Harry Potter and Draco Malfoy.
by SloppyKissesFromGrandma October 3, 2016
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