Def: the title you give the female you are in a relationship with after the dating stage, but prior to giving her the actual name of “girlfriend.” Usually this person will attend events, go to family functions and act in a girlfriendly manner but not have the title.
This word can also be used on the opposite sex as a not a boyfriend.
Kelley: No way, she wont make it out of the NAG (not a girlfriend) stage for awhile.
Eric: yeah all the benefits, but you can still be single.
Kelley: Yeah, that’s the life.