What is Shasta Pack?
1.
The well-defined abdominal muscles of a skinny short person.
That nerd had one hell of a shasta pack!
See
2.
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.
See
