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1.
To exercise, eat less, and get in shape for the purpose of going to Lake Shasta, California.
Michael: You're going to the gym for the 7th time this week?

Big Steve: Yeah man, I gotta shastasize.

Dont eat those carbs... shastasize.

Woah, are you eating candy... I thought we were shastasizing.
by sme5on March 01, 2011