go down on someone

go down on (one)

vulgar slang To perform oral sex on one.
See also: down, go, on
Farlex Dictionary of Idioms.

go down on someone

in. to perform oral sex on someone. (see also eat.) She was just gonna go down on him when the camera panned over to the window.
See also: down, go, on, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • go down on (one)
  • eat at the Y
  • dive a muff
  • B.J
  • blow job
  • beejer
  • bejeer
  • sixty-nine
  • give (one) head
  • lick (someone) out