What is slag off?

Slag off is go from here

Bart to millhouse: slag off i said slag off

slag off - video

more or less being insulting or dorogatory in a sexual way..

"she is a slut"
"Oh Bob you fucked her last night stop slagging off"

"she is a slut"
"Oh Bob you fucked her last night stop slagging off"

a Northern England expression intended to rudely dismiss someone or rudely tell them to leave, go away, akin to * scram, get lost! "

So, after I boinked her, we were done but she wouldn't just leave, so I says to the tart " okay, now, well, slag-off!" and then she left in a huff.

Originates from Essex meaning when someone is chatting shit about you behind your back and obviously you confront them about it saying:

Person 1- apparently you've been slagging off jasmine

Person 2- says who? I can promise you now I ain't said one word about the girl.

This kid was slaging me off so i decked the cunt

A person insulting you or another.
Slagged = insulted

Dave slagged me off behind my back

A term used to explain when someone is talking behind someone's/your back.

I heard Emily slagging off Connie earlier.

Another term for "shut the fuck up" or "shut your fuckung mouth".

Jack was boulshitting all the day, so I asked him to slag off.

He.was.slag.ging.me.off.in.the.bar.so.I.beat.him.and.fucked.his.bitch.har.har.har.

YEAH YEAH YEAH

The phrase 'slag off' is used in many ways, meaning somebody has been talking about you badly to another person

Jenny was slagging you off yesterday, she said you were ugly. She slag off me all the time