talks shit over facebook but can barely stand up for them selfs any other time.
liz:(typing)if anyone talks shit about me again it wont be pretty let me find out.

kenny: STOP FACEBOOK FLEXIN YOU KNOW YOU WOULDNT BE SAYING THT IF YOU WASNT ON FACEBOOK
by yusuck March 10, 2011
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A term used to describe the "voluntary" act of erecting the penis.
Me: "Hey bro what are you doing?"
Bro: "Flexin' the D and playing GTA5"
by dickguru October 15, 2013
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To flaunt or show off without having knowledge or intent of doin so.

See also Flexin
Bob: Damn! Did you see Sarah today? She was looking good!

Tom: Yeah man, She's Backstreet Flexin'!!
by MrBlckStallion November 25, 2013
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Driving a lifted GMC Denali outfitted with the latest offroad accessories. Thus, exhibiting an aptitude for spending money, by modifying the most luxurious truck offered by General Motors.
Man! I had to take my Dodge back to the house when he came through Denali Flexin in that new GMC.

She didn't even wait for the step to swing down jumping out of that Ford when she saw me and my boy Justin Denali Flexin from across the parking lot.
by gimpchicken November 29, 2015
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When you flex your right bicep in your closet to show off to your lady friend and then you end up accidentally punching her in the face.
by Uniform Chick3n November 16, 2017
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Showing Off, For bravado, or for women (or both for that matter). posturing, or attempting to be the "alpha male"...
See:
flossin, floss, flexin', etc...
"There's some fine bitches up in here, i gots to start flexin the mexican, nah mean?"
by doug March 25, 2004
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