double nipping 

Sorry ladies, double nipping is limited to women with tits large enough to get the nipples close enough together to suck on both of them at the same time.

She loves double nipping, especially while she is riding on top.

double nipping by 2B+ October 25, 2016

Double Nippin' 

Derived from the term double dippin, Double Nippin refers
to a mother who is breast feeding her child on one nipple then
decides to change to the opposite nipple during the breast feeding session.

Reasons for double nippin may vary from mother to mother.

Guy #1: dude, did you see that mom last night double nippin' at the Christmas party?!
Guy #2: heck yeah man, she was hot!
Guy #1: yeah, and we got to see both nips!
Guy #2: woo hoo!!

Double Nippin' by cwazyboy123 December 10, 2009

DoubleDipping it 

When you have sex with you’re girlfriend and her mum

I’ll be DoubleDipping it tonight

DoubleDipping it by Class but expected December 6, 2018

doubledipping 

When you are having anal sex(with a TS, male, or female) and the person on top, pulls his cock out of the ass and then rams it back inside and then pulls it back out. Usually, doing it fast or slow....this can create a massive sensation of pleasure, due to the nerves around the anus.

Damn, your cock felt sooo good when you were doubledipping my ass and slapping/rubbing the tip against my hole!

doubledipping by thamacdaddy December 13, 2021