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2.
a tattoo located above the buttocks, generally spanning from one hip to the other

also termed as "Santa Cruz license plate"
Molly's pants were so low cut you could see the bottom of her license plate.
by m3g April 07, 2005
 
1.
A tattoo, usually located at the base of a female's (generally one of loose character) neck. Used to identify said female during heavy drug induced doggy style sex.
Chad was so stoned, the only way to he was able to remember the bitch was by her license plate.
by mjoblio May 31, 2004