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fat chips 

usually a fat guy thats made fun of just because of its size and overweight.
hey look fat chips is coming run he is hungry.
fat chips by crazystar March 22, 2009

Poon Chips

The aftermath or end result obtained by allowing puss / loin juice to dry on one's beard or goatee, often a tell tale sign of being nose deep in moose knuckle.
Neil: "Hey dude, you hungry? Let's go eat."

Bob: "Naw man, I've been snacking on leftover poon chips all mornin. Tasty shit!"

OR...

Wesley: "Hey man have you been eating a bear claw? You got donut glaze all over your face."

Lar: "Man, that ain't donut's them's is poon chips!"
Poon Chips by Tommy T June 17, 2004

Pussy Up Chips 

John: Whats wrong?
Jack: My girlfriend dumped me cos I look a bit like a parrot.
John: Pussy Up Chips, plenty more fish in the sea.
Pussy Up Chips by Kim Mitten July 20, 2008

like a dog eating hot chips 

from Roger's Profanisorus, Viz.

a style of fellatio; an exuberant blowjob
...and there was Vera, on her knees, at his cock like a dog eating hot chips...

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.