1. The sexual act of inserting one fist i to a woman's vagina and the other into her anus, simultaneously.
2. A colloquialism in jest of a previously described sexual act, i.e. holding and drinking an alcoholic beverage in each hand, simultaneously.
1. Last night this drunk whore let me double fist her until she squirted
2. Check out Robbo double fisting his ass across the bar!
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