From "tribadism" which refers to lesbianism. Derived from the Greek "tribas" (a lesbian) and "tribo" which is the verb "to rub".

Refers to "scissoring" which is when two women rub their vulvas and clitoris together as a form of non-penetrative sex. Can also refer to "frottage" (rubbing) of the woman's vulva against something for sexual stimulation.

Not specific to humans, this behaviour is also observed in nature. In particular bonobo monkeys, where female to female genital rubbing is common (about once every two hours).
You've never tried tribbing in the missionary position? You should!
by Elizababe May 11, 2013
when lesibans rub their vaginas together in a humping motion. usually works better when they are both shaved.
hey lisa you wana trib? whats that, ive never done it before. just trust me it feels good, you are shaved right? i try to teach tribbing as much as possible.
by reaper76 May 12, 2009
When two women engage in lesbian sex and rub their genitals together for sexual gratification.
Claire and Veronica scissored their legs and ground their pussies together, "I love tribbing" Claire whispered in her lover's ear.
by Steve0371 July 29, 2009
The lesbian act of gridding the vaginal region against a parteners vaginal region.
by DC February 11, 2005
A survival technique enabling two women to start a fire using nothing but their vaginas. Both women must be without cloths and pressed against each other in a scissoring manner. They then must rub, hump and grind their womanhoods together causing a rather tremendous amount of friction. This can sometimes take a while but if done correctly over a dry pile of tinder, a single spark can produce a roaring fire.
...After our canoes flipped and all of us were soaked to the bone in below freezing temperatures, I thought we were all doomed. Luckily, Mother and Aunt Joan knew exactly what to do and wasted no time. Within minutes they were producing enough smoke to send a signal for help and finally after a few sparks came off of them we were able to start a fire big enough to keep all of us warm and dry untill help arrived. Tribbing saved my life and the lives of those I love.
by McTobes August 18, 2019
Vagina parts rubbing against each other naked, clits and bits touching and grinding the goods into each other. sexual position for being intimate.
She sent me her pussy pic to tease me. She does that whenever she wants me to trib on her. I’m going to give it to her tonight .
by Cognitio May 5, 2018
When two girls rub their pussy’s together, also known as scissoring. Rubbing their clits together makes for great sex and is so great. I’ve done it a lot, and you’ll never want to stop.
1:”I did tribbing with Jessica last night, I want her even more!”
2:”Girl that is so hot, do it with me?”
by redditwhore On IG June 11, 2019