Top Definition
An older expression (circa 1950's) used to describe the action of leaving one's present location (see outie)
"Gotta work in the morning, so I'm gonna hat up."
by B.T. Foster July 27, 2006
1 more definition
10 Words related to hat up
To wear a condom.
"Did she make you hat up?"
by Seros October 16, 2008

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