One of the mysteries of the English language finally explained.
1Baseball. The third of the four bases which the batter must touch in succession in order to score a run.
2Slang (chiefly North American). The third of four notional stages of sexual activity, usually characterized as the stimulation of the genitals or (in later use) oral sex.
Mid 19th century; earliest use found in By-laws & Rules Knickerbocker Base Ball Club. From third + base.
third base/ˌθəːd ˈbeɪs/
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