the act of sticking your finger through the zipper of your jeans and humping girls or guys for sexual pleasures, with an open mouth and making awkward sex noises.
Steve: Hey Jezzy, look!
Jezabelle: Get your finger dick away from me!
or
Steve: Uhh Uhh, YES OMG ALL THE WAY BABY!!!
Eric: Umm Steve, I'm a dude and get your finger dick away from me!
Steve: The fact you're a dude makes it more interesting, and I know you like!