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1.
Somewhere you can't get a mobile phone/cellphone signal or car radio signal
Say that again dude - you must of hit a not spot
by oddbillie August 10, 2009
 
2.
A parking space in a "Multilevel Parking Facility" (Parking Garage) which is actually not a legitimate parking spot, but would make sense if it was. In fact, not spots are often mistaken for real parking spots, and used without consequence.
John: The garage was full today, so I parked in this not spot.
Bill: Wow...I've never even realized that wasn't an actual spot.
John: Heh, neither have the rent-a-cops; I've never seen anyone get a ticket for parking in that one.
by McGuirk808 April 13, 2008