Of or like Shasta, having Shasta like qualities characterized by extreme lameness.
Being extremely lame.
Girl: Did you go the party on Friday?
Boy: Yeah, it was shastalammagexcore. I got kicked out by somebody who wasn't even the host.

Girl: That girl is so shastalammagexcore. Check out her nasty Aladdin sweatshirt!
by Sahara April 18, 2005
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