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."
Pronounced like molasses (muh-las-iz), it is someone who has a small or below average sized ass. It isn't a medical diagnosis, it is simply the fact that someone has a small ass. It can be used as a name to call someone with a small ass, like a nickname, or it can be used to describe the person's ass directly. When figuring out if someone has smallasses, you only take the size of the butt cheeks into account. Quality and color of the ass are not relevant, nor is the gender of the person. You don't need to see their bare ass cheeks to make the decision that they have smallasses either. Simply giving them a friendly grope can help you determine. Typically, if you can fit most of one of your hands around one of their butt cheeks, that is a good sign of smallasses.
Hey, smallasses! Get over here!
I walked pastTimtoday on the way to close and I noticed he had smallasses.