1 definition by supersnowman93

Top Definition
When a young female puts their hand on their hip with their elbow bent at a 90-degree angle. Inspired by prom pictures and attempts to make arms look tiny.
Katherine had such bad Prom Arm in all of the pictures from last night. I think she was trying to impress Sean by tricking him into thinking she has tiny arms.
by supersnowman93 December 12, 2012
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