An archaic term dating at least to the 1860's meaning to tease sexually but not satisfy (see blueballing). Can be used for both males and females.
Lord Daft Wager: I say, your wife certainly jewgagged me something fierce last night in the closet at the costume ball.
Buzzkillington: That wasn't my wife, that was me old chap.
Lord Daft Wager: Blasted costumes...