A big arm test is a visual check of the diameter of a girls arms to determine if she will blow up in the future. If a girl has large arms but a small body while young, chances are she will become fat in the long haul.
person 1 - "damn, look at that girl on the beach, i'd marry her!"
person 2 -"nah dude, she fails the big arm test, shes gonna blow up like a blimp"
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