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When a fat women losses a little bit of weight and all of the sudden thinks she's skinny and then proceeds to wear skin tight leggings and other tight attire that was not intended for her weight class, she has become a smallrus.

Origins - Small and Wallrus
Friend - "Dude my sister has lost a little bit of weight and is starting to wear slutty skin tight cloths."

You - "You sister has entered the next step of her evolution, shes a smallrus."
by dzuari February 25, 2015
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