1. A curious type of female typically found living in urban settings; possessing an unusual, some would say deathly, fear of growing up and getting married. 2. One who is single; having experienced her fair share of martini hangovers and painfully awkward what's-your-name-again conversations that tend to occur in the wee morning hours.
"Victoria is such a singletini. She's always out on the town and flirting it up."