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1.
Substituting the letter 'z' for an 's' in marketing, or more commonly, rap, to try to sound ultra, only the word is actually pronounced with an ssss and not a zzzz phonetically.

Synonym: Zpelling
"Did you see that sign that said Krazy Katz? That is some bad-azz zubstitution.
by DMD0cal February 04, 2010