Similar to the use of 'Raw Dog,' a Naw Dog happens whenever on the brink of sexual intercourse, someone completely backs down or gives up. It could be from disgust or lack of interest, but sex COULD have been had and was not (if sex wasn't guaranteed, it wasn't a Naw Dog).

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naw⋅dog nah dawg, interjection - An unsatisfactory but widely ignored verbal response used by US Marine Reservists (particulalry of N "Nacho" Btry 5/14 Marines, Pico Rivera, CA) to express reluctance towards an assigned task. Used interchangeably with, "negative," though the speaker must use very careful judgement when choosing who to respond, "nawdog" to. Nawdog should never be said to Staff NCO's or above except to intentionally lose stripes. Often used to avoid doing someone a favor or extend a nap.