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1.
The face made in the final seconds before you ejaculate. It looks like someone is holding a cup of vinegar under your nose. The few seconds when you are unable to stop humping your partner even if it means life or death because you are about to bust a nut.
1.Tom was sleeping with a married women. He was sticking it to Mary when her husband kicked in the bedroom door. Tom couldn't run away from Mary's husband because he was making his vinegar face.
2.When Joe was making his vinegar face he looked like a wild donkey getting circumcised.
by sk1979 November 23, 2010
 
2.
The name given to the expression on a mans face during orgasm
When getting a blowjob in public avoid making the vinegar face,
by csquared March 15, 2004