An exclamation used in place of Wow! or Tits!. Can also be used as a verb. When used as a verb, it means to punch someone with your breast.
Guy 1: That girl is soo hot.

Guy 2: Be careful though, I tried to grab her ass with both hands and she tittely doo-ed me into next week.

Guy 1: Tittely doo!
by Domiboy3 March 6, 2014
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