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1.
A fake migraine employees fabricate to get out of work on Friday, thus securing a three day weekend.
"I could use a long weekend. I feel a Frigraine coming on."
by P. Boyton July 10, 2008
 
2.
A migraine on a Friday.
After a hard week of working, or being a school you always seem to get that pulsing headache.
'Ugh I don't think I'll be out tonight, got the biggest frigraine.'
by Philippaaa January 29, 2009