piss on my chips and tell me it's vinegar. 

This is a 'mangled metaphor'. It mixes up 3 idioms:

Piss on my leg and tell me it's raining
Piss on one's chips
Piss and vinegar

To deliberately and painstakingly go out of one's way to ruin a friend's chances of success. Usually done jokingly with reference to the opposite sex.

No way do I want you as my wingman. You would piss on my chips and tell me it's vinegar.

piss on my chips and tell me it's vinegar. by fuguez September 26, 2009

Vinegar Stroke 

The point during sexual intercourse where a man is irreversibly about to blow his load. The very worst time to have to cease coitus in an emergency.

Shit! I was on the vinegar stroke when Julie's dad burst through the door.

Vinegar Stroke by Busted Hyman July 9, 2006

Vinegar stroke 

The facial expression during sex that coincides with the last thrust before coming.
Imagine the contorted 'fuck face' being pulled by the male as hes about to come, and compare to the wincing one would experience when sucking a lemon, or tasting vinegar. Hence, the vinegar stroke.

Ah man, I was banging this chick, and I was up to the vinegar stroke when my phone rang. Ruined the moment.

Vinegar stroke by Jaberoni March 13, 2009

Vinegar Salt 

Ghetto way of asking for Oil & Vinegar, Salt & Pepper when ordering a sub at Subway or Publix...

Sandwich Artist: "Anything else on that?"

Ghetto Customer: "Gimme sum of dat der vinegar salt"

Sandwich Artist: "You mean oil & vinegar, salt & pepper?"

Ghetto Customer: "Yeah dat stuff"

Vinegar Salt by J Dawg82 May 25, 2009

Vinegar Shot

A Vinegar Shot is the contorted face pulled by all men approximately one second prior to ejaculation; So called because one's face momentarily becomes similar to that experienced when drinking a large quantity of vinegar. The Vinegar Shot is quickly superceded by the Money Shot.

Tim pulled a total Vinegar Shot just before he shot his bolt all over her tits.

Vinegar Shot by m0nkfish September 2, 2008

vinegar strokes 

the pre-orgasmal point of no return for men during the sexual act, where failing to blurt your mess will result in blue balls

i was pulling up to the vinegar strokes when she woke up and caught my sticky gift in her freshly opened eye

vinegar strokes by linton gillespie April 23, 2006

Vinegar Strokes 

The final moments prior to when a man orgasms. At this point he can no longer stop himself from ejaculating no matter what happens. He will make a face as though he has just smelled vinegar. It is said that if you peer into a man's eyes during his vinegar strokes you get a glimpse of his soul.

Justin and I accidentally walked in on Kyle during his vinegar strokes. Now we know things about him that no other person can.

Vinegar Strokes by FlexPPE1 November 22, 2011