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1.
The act of abbreviating or sometimes lengthening a word, phrase, name or idea for use on a vehicle license (vanity) plate in order to fit the message into the space allowed (usually 7-8 characters) or because the correct spelling is already taken by another license plate owner.
"Hey, I got my Mississippi Native vanity plate the other day!"

"How did you vanitize that for the plate?"

"It's MSNATV"
by shawnblog July 05, 2009