Switch-Hitter Meaning

(idiomatic, colloquial, sexuality) A person who engages in sex with persons both male and female.

Example: 1961, National Association of Basketball Coaches of the United States, American Football Coaches Association, Athletic Journal, Volume 46 Page 23
  The average ball player can become an effective switch hitter only if he has switched hit from the time he commenced playing.
1983, Edmund White, States of Desire: Travels in Gay America, Page 218
  I met this fat, balding, bisexual 'switch-hitter'— that was his word, 'switch-hitter'— and he was my first experience."