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2.
A-ration bagged meal issued to Marines (usually recruits or in the field) that usually contains: a sandwich (ham, turkey, and bologna are common), a hard boiled egg, fruit, and a small bag of potato chips; often served with a beverage such as juice or milk. Also used to describe a female Marine in a sleeping bag.
Andrew: Look at that bag nasty over there
Kevin: Ehh..shes not that good looking
by CORE KeyMaker August 29, 2009
 
1.
Noun - means a "sack lunch"
Damn, I missed the roach coach, guess I'll have to eat the bag nasty
by A Young Gun July 01, 2006
 
3.
Typically, a female who makes the conscience choice to be more stuck up than she is attractive; therefore neutralizing any positive attention from the opposite sex. Also, a female participant of an M.C.J.R.O.T.C. program.
Yo Hero, there goes Bag Nasty.
by NavyHero March 26, 2008