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1.
A Thursday for a student at HAAS (Hawaiian academy of arts and science)

Because we don't have school on Fridays at HAAS so Thursday is HAAS Friday
cheeeeeeeeeeee its haas friday already!
by --Lenny--- November 16, 2007
 
2.
This refers to Thursdays at the Hawaii Academy of Arts and Science. Every Thursday, is a HAAS Friday, because HAAS has no school on Fridays, ever.
FUCK YA! Its HAAS Friday!! Prepare for another 3 day weekend!
by Ryder_Puna November 21, 2007