When someone says he/she will do something and then does not do it because of of laziness, irresponsibility or worthlessness. Can also mean when someone needs to do a task within a certain timeframe and then gives notice of failure after the time has expired.
Sean: Hey Jeremy, can you get me my tickets before 6:00pm tomorrow?
Jeremy (at 6:30pm the next day): I will not be able to get you your tickets.
Sean: Damn, that Jeremy is always swiffing out...
by baaaaaaaab January 17, 2010

5 Words Related to Swiffing out

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