Top Definition
The premier method to determine whether a woman is a chubster or a non-chubster.

Look at the upper-arm and determine if there is excess skin/flab/meat between the bicep and shoulder - if there is excess skin/meat/flab and she is not a body builder, then she is a chubster.

It was created as a result of women becoming social media sorcerers in that they can mask any and all fat.
"This girl on Tinder is doing that skinny arm trick, I can't tell if she's a McFatty." "Apply the arm test, bro."
by likeschubsters January 07, 2014

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