Vasc is short for vascular and is taken from the term "All Vasc" which is another way of saying "All Veined out"
Vasc means stupid, dumb, bailing, retarded, or simply stressed out.
That chick is all vasc.

Bro, this shit movie is all vasc.

Stop being all vasc and lets go hang out.
by UltraViolentClockwork November 10, 2017
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