sockpuppeting 

When you fist someone so deep you can control them like a sock puppet.

Jim: Last night, I fisted Emma so deep that I could control her like a sock puppet.
Matt: Sockpuppeting sounds gross.

sockpuppeting by Brawbag November 24, 2016

Sock Puppeting

To insert, in a sexual manner, your hand/fist into someone, preferably up to the wrist or deeper and wearing their body like a sock puppet.

I heard Sam is such a slut, they consider sock puppeting a first date.

Sock Puppeting by sircharlesthebarkley April 21, 2022

Sock Puppeting

When you fist a petite woman up to your elbow. And flap your hand inside her as if to make a puppet talk.

Did you hear about CJ sock puppeting Lyndsey last night? Yeah I don't think there will be a second date...

Sock Puppeting by TheGrimmRipper June 12, 2020