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1.
Referring to when you stick your first two fingers in someone's anus and leave your thumb out on the cheek and start to squeez your thumb and first two fingers at the same time so your two fingers are massaging the inside of the persons anus and the thumb is massaging their buttcheek as well, thus resembling a trigger of a gun being pulled.
Bro, last night Johny was pullin' the trigger non stop!

Yo Dad, your pullin' the trigger like a pro!

I even practice pullin' the trigger with my step sister!
by tophieCC July 07, 2011