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.
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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"
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Slag off is go from here
Bart to millhouse: slag off i said slag off