Pulling your hand inside of your sleeve, and then using that hand to hold a cold beer in order to prevent said hand from getting cold. The result is one arm appearing shorter than the other.
"Hey Phil do you have a can koozie? My beer is way too cold to hold bare handed."
"Why don't you just shortarm your beer?"
"Thanks. This works great!"
© 1999-2015 Urban Dictionary ®
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