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1.
Originates from seafarers: Back off, move far enough away you're no longer a bother. Go on, out of my way, or face. Leave now before we both regret it. Usually, a bit of danger is implied; slight provocation or minor threat.

Still used by those whose cultures &/or peoples having some sort of seafaring ties back in their heritage.
Maggie: How was your date?

Molly: Oh, sling your hook Maggie.

Maggie: Or what?

Molly: Not a day to press your luck.
by Egnir April 14, 2010