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A person who inexplicably vanishes before your eyes. They appear to be of normal human composition with the exception of their uncanny ability to simply be 'there' one minute and 'not there' the next. A vanisher may or may not engage its witness, but invariable ends up by stepping at least partially out of view for a split second and then disappearing completely. This is not a matter of object permanence, as an immediate and thorough inspection of the area which they supposedly entered will invariably reveal no sign of their presence. Revenants of sorts, they tend to manifest themselves mainly between the hours of 3 and 5 a.m.
Holy shit! That guy just stepped around the corner and then he was gone! I mean, I just looked back there and he's nowhere to be found...

Yep, that's a vanisher.
by Will93 September 28, 2011
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2
A sexual manoevure where a man is performing anal sex on a woman in front of a window and another man is standing outside the window. The first man takes his penis out of the woman's anus, pretending to take a break and jumps out of the window, allowing the second man to step in and continue the sex.
After Adriano got puffed out, Alec stepped in with a professional Vanisher.
by Adriano Ventra October 29, 2007
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3
Person that although awesome in its core, is very unreliable, disappointing at times, has a lack of presence, effort and/or fulfillment from his part in relationships.
The father of the kid was a real vanisher so she divorced him.
by snav98 February 06, 2017
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