Are you slaggin' the lagan ? 

A rhetorical question used as a retort when someone says a stupid, crass, or offensive sentence. The Lagan is a river in Ireland on which the City of Belfast is situated.

Person1: He's an idiot !!
Person2: Are ya slaggin' the lagan?

Are you slaggin' the lagan ? by Michael O'Meara December 23, 2003

sagging pants 

when a gay male is looking for a gay mate

“why do you have sagging pants”
“i’m looking for a gay boyfriend”

sagging pants by purple cherry tree June 25, 2021

Slanging Match

British slang, a slanging match is an argument; a dispute in which insults and accusations are made by each party against the other

Television debates by politicians often deteriorate into a slanging match.

Slanging Match by AKACroatalin April 17, 2015

slanging that iron

slanging a gun;killing people

i been slanging that iron ya herd meh ! neva been pussy

slanging that iron by kyiy May 5, 2018

Swaggin Wagon Dragon 

Your number one best friend. No one is above them and you are perfect for each other.

They are swaggin wagon dragons and will be together forever.

Swaggin Wagon Dragon by ballerg17 March 8, 2017

Shagging Shirt 

Every single gentleman at one time or another has had that one shirt that provides unrivaled luck with the ladies on a night out.

"Are you out tonight mate?"

"Am I! I've just ironed my shagging shirt! I'll be dusting off a few Turbo Chargers in Mission looking for a few game tarts".

Shagging Shirt by The Badger of Hull October 3, 2014

Skagging 

Verb, meaning to 'come down' off MDMA.

Jaysus, I'm really skagging after those pills last night.

Skagging by magpiesmust October 3, 2011