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1. white top
Used to describe old people, generally with grey hair. Used as a term to express frustration at any old person ahead of you in traffic, a store line, etc.
"I was stuck behind this White Top in Wal-mart counting pennies to buy her Metamucil."
2. white top
a toyota fj cruiser due to the fact that they all have white roofs
we saw a jacked up white top with a brush guard and snorkel