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Usually referred to as a NAG.
Pronounced: nag
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.
Eric: have you seen how much JP and Kristina are hanging out? I think he really likes her!
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.
by Bessie Lou November 06, 2009