gash back 

something or (someone) that is so completely and utterly gash, they qualify for gash back. in short, gash of epic proportions. or just generally a term for skanks, who spend the majority of their time on their backs.

you're more than a slut, you're a walking gash back.

OR

stop talking shit, i didn't ask for gash back.

gash back by XxDxX July 31, 2007

Gash-back

A flash back of some memorable gash a.k.a vagina. Was first coined at 4:25am on the 5th of december 2011.

e.g. I'm having a gash-back

simular useage to flash back but only refers to gash.

Gash-back by Kai-pachi December 6, 2011

Back Gash 

- Generally a term used to describe one's anus (a.k.a arse hole)

- Comes from the word gash - which is a slang word for a vagina

- Back Gash is a term is often used by gay men.

Gay 1: How was last nighe?
Gay 2: Good, but my back gash is really sore! He was HUGE!

'I shouldn't have had that indian food last night, my back gash is killing me'

Back Gash by Liam D - Official Welsh Scene Personality April 20, 2008

Gashback 

When you spend obscene money on dating, and are finally rewarded by securing some gash.

After dating 5 women, I finally got some sex. 20% gashback!

Gashback by RandyRhoads84 December 21, 2020

Gashback 

Bastardised version of cashback. Used to describe the taking out of cash in order to go out and chase gash

Gentleman: Two cartons of um bongo and a packet of skittles please shopkeeper
Shopkeeper: Certainly sir, any gashback?
Gentleman: £20 please, I fancy a spot of wenching tonight and need some funds
Shopkeeper: Very good sir

Gashback by bigmikey November 2, 2005

Gashback 

When you’re pissed up and start texting your ex girlfriends.

I was seriously on it last night and ended up having a Gashback and texting that slag Tracey!

Gashback by MrAnderson79 December 24, 2017