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1.
In common usage in essex. When an awkward or tense situation arises, all tension can be examplified with this gesture, in which both hands are made into fists, placed on top of each other and rotated in opposite directions as in a salt grinder.
Man 1: Dude she's hot.

Man 2: That's my mum.

Silence.

Awkward Salt Shaker performed by passer-by.
by Awkward! May 09, 2010