⇨ vinegar stroke; vinegarnoun the final penile thrust culminating in ejaculation when copulating or masturbating. Alluding to the facial expression of the male. Also, in the plural, 'the final thrusts preceding ejaculation'. UK comedian Phill Jupitus, who uses this term to describe the closing moments of his act, explains: 'Just before a bloke comes he looks like you've popped a teaspoon of vinegar into his mouth' AUSTRALIA, 1961