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1.
An insult that refers to someone of a hefty stature. Usually used when you are suddenly ticked off by an idiot and can’t think of a better way to make them feel bad at that very moment. An excellent way to convey your frustration about an oaf when you are cut off driving or in a crowded mall.
"Move it along now chubsy!"
"jesus look at chubsy here blocking the flow!"
by Ian December 14, 2003
 
2.
a round, plump girl usually in medical school who eats far too much and still complains that she can't lose weight.
Fucking chubsies had a whole pizza at lunch and told me later that she can't believe she's still gaining weight.
by Derf Diggler September 25, 2006