N.I.W.S, standing for nan I would shag. It's as simple as that, a granny or a nan who you'd bang.
Damnnnnnnnn that golden oldy shopping for her dentures is an N.I.W.S
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Basically meaning, f*ck off or piss off, but in a more banterous way.
"I finished the homework all by myself"
"Crat off Sullivan, you couldn't even wear your pants yourself"