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2.
Non Official Seeing Person/Non Official Seeing Partner

cf osp
That stage in a relationship where you kinda-have-something-going but you are not sure what.
Your friends say "is he/she your boyfriend/girlfriend" and you don't know.

Alternativly, a shag buddy.
"Tom and I? No, we're just NOSPs."
by atonym February 01, 2006
 
1.
not our sort of people
- a right numpty, complete keith or wrong'un any of which would pass as a nosp.
by Toby Wright September 04, 2007