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Someone who changes actions or mannerisms at a moments notice with friends or associates.
Niggas will switch up that fast these days...
by 012396DaRealest March 09, 2017
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when ur mood is calm , then someone does something, they your mod faes up and you are really mad in an instance, uve switched up
happy boy, someone steps on his toe at goose fair, boy switches up and starts smackin' the place out
by JunioR SkYline October 02, 2003
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