Arch back 

A flat girl who arch's her back to make herself look thiccc

"Look at that mirror pic Emilee took, she's such an arch back"

Arch back by Hailayeeeee September 14, 2019

Arch Back Fanny Girl 

A Female that has her vagina positioned further back towards her bum. These females generally have the sexiest body. Furthermore these females are the best to have Doggy Style sex with.

Kam: Oh my god, check that girl out!

Carl: That's a Arch Back Fanny Girl right there!

Arch Back Fanny Girl by ArchBackFannyGirlLover July 17, 2011

National arch your back day 

June 1st , walk around with your back arched like some flat girls at school. Because it’s what you guys are best at archin dat shit

“Hey it’s national arch your back day act like the thots !”

National arch your back day by Hotjalapeño May 21, 2019

arch ya back 

To break your back while twerking or in any kind of sex position

Go ahead girl and arch ya back

arch ya back by Royalty_Bri November 28, 2017

arch it back 

v.

1. A phrase commonly used amongst players and pimps to describe the arch in a females lower back. This phrase is used to compliment the female on her arched back and her curvacious buttocks whether she arches her back purposely or naturally, bending over or standing up.

1. "Oh damn, that's that girl from the beach, yeah, the one with the phenomenal ass, Arch it back!"

2. "Ab-so-lute-ly! For the love of it. Arch it back at a medium pace if you have to."

3. "Arch it back... just like that, now turn around and watch me. I told you we could cure that headache girl"

4. "Can you pass me the salt and pepper baby? Damn girl, arch it back if you have to, that't what I'm talking about."

arch it back by Thomas Elliott May 13, 2006

Arch Backed

Protective and defensive over a matter

Then she got all arch backed when I said she could do with losing a few pounds

Arch Backed by Yasdnil March 15, 2014

Arch-Angel-Buttcheek-Backspread 

A term coined by YouTuber Ian Carter, A.K.A. Idubbbz, meaning to lean over in the shower as to let the water go in your butt crack.

I kept on getting hair stuck in my asshole, so I used the Arch-Angel-Buttcheek-Backspread and it cleared right up.

Arch-Angel-Buttcheek-Backspread by Kitten Corp. June 4, 2018