Having yourself on toast 

The person loves themselves that much, they are so up themselves that if they had a round of toast they would definitely spread themselves on it. They are loving themselves sick.

'look at her over there, she is definitely having herself on toast'

'you're having yourself on toast ain't ya'

Having yourself on toast by Dr Toast August 10, 2012

Having a Ninge

To behave like a Ninja for a period of time. To act in a very sneaky manner for the purpose of overcoming ones goals.

"Has anyone seen Dave?"
"Nah, pretty sure he's off having a ninge."

Having a Ninge by Tedsvilles June 18, 2014

Having the painters in

Slang word for period/ that time of month.

My christmas sucked, I had the painters in.

Having the painters in by anagram November 28, 2004

Having Kittens 

If someone is getting particularly worked-up about something (usually excited/annoyed).

Luther: So is Katie excited about getting into Harvard's?
Cyril: Are you kidding? She's flippin' having kittens.

Barney: Are you pissed that we have another long English assignment that we have to re-do?
Chester: Yeah man, I'm having kittens over here!

Having Kittens by It'sFrickingMe June 27, 2010

having fun 

when your having fun it means your drunk or your having sex

mom: what were you doing with your girl friend
me: oh having fun

having fun by NameSiren435547 January 18, 2021

Having a mellow one 

Avoiding exposure to anything other than:
a. Cannabis
b. Pimp my ride
c. Playing guitar
d. Listening to incubus

"You out to night brains?" "nah think i'll have a mellow one"

Having a mellow one by TSC - Eric April 12, 2005

Having a glass of wine together 

UK slang for felattio.

Downing Street said that the MP “flagged up” the couple’s relationship to Foreign Office officials after finding them “having a glass of wine together” alone in the Foreign Secretary’s in 2018.

Having a glass of wine together by Jacob Rees-Bunce July 1, 2022