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1.
To advise someone to stop doing "stop moaning" or "stop chatting sh1t"
Example 1.

Dude 1: Hey bro, I'm going out on the pull tonight so likely I'll be back with some hot totty

Dude 2: Dude, squash that noise, you're always on about it but you never pull cus you're a duche

Example 2. - At the pub

Dude 1: Boy's I'm strapped for cash cus my Mrs left me and took everything

Dude 2: Squash that noise, you know I've got your back, drinks on me dude
by The Specialist-age June 24, 2011