What is IYAOYAS?
IYAOYAS meaning in Military or Military Slang terminology / glossary / dictionary is:
(U.S.Navy/Marine Corps)If You Ain’t Ordnance You Ain’t Shit. Used by Navy and Marine Aviation Ordnancemen as a greeting or farewell to other Ordnancemen or an insult to those outside the rate as in “IYAOYAS mother fucker”. Pronounced “ai-yo-yas”.