Sticking your finger in and out of a hole, repeatedly.

fingering a gurls pussy

To repeatedly shove your finger up an anus

to finger a virgin vagina or anus. like popping a cherry, but with a finger.

to finger pop with more than one finger is also acceptable.

To masterbate.

Finger pop is the act of popping your finger into a woman's snatch. It is employed by teens on a "car date" or by anyone who is trying to gain entry to the vagina. Finger popping is begun with the FINGER POP. It is also utilized to get the initial wetness and odor of a snatch.

noun: a douchebag troll on the internet