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The well-defined abdominal muscles of a skinny short person.
That nerd had one hell of a shasta pack!
by chris_v June 13, 2007
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a way to describe an alarmingly skinny males stomach muscles. they look like a six back but more compact and cute. like the miniature cans of shasta soda.
Baby, you need to gain some weight, you've got a shasta pack.
by cherie ann June 13, 2007
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