look up any word, like cunt:
1)Always cool or in style
2)Colloquial for Marine Corps Aviaton
3)Always traveling through the air
1) That guy is Semper Fly!
2) I want to go Semper Fly and pilot Harriers!
3) I'm never driving to Wisconsin again! It is Semper Fly for me now.
by NewPhase April 08, 2010
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