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When you're doing an activity (such as packing, moving or redecorating) that involves many bags, boxes, and stuff being stacked precariously on top of each other, or an overloaded case that is top-heavy and unstable. After some battling with the cases, boxes, bags etc., it appears to finally be stable, so you leave it. As SOON as you move away from it, you see and/or hear the contents or the whole container ever so slowly slipping. And you have about 5 seconds to grab it before EVERYTHING comes crashing down. The part where you slowly hear it slipping little by little is the slipsies.

Added bonus when you do catch it, get it stable again, and then you hear the slipsies occuring AGAIN.
Puff pant, phew I can't believe I managed to get 35 items into that one bag! Time for a fat one. (Looks away for 1 second, hears a slow rustling, looks back and sees the bag starting to deform more and more on one side).
by Lefty Power 123 March 24, 2017
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A dodgy gypsy that will get away with your many and your drugs.

A slut or a dodgy female pretending to be a hippy.

Possibly an Alcoholic.
That fucken slipsy stole my man.

Carol, did you see thay slipsy get away? All my drugs are missing.
by Carol12 April 06, 2018
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