Piss in your cornflakes 

1. To disprove someone or make them sad. The term is usually used as part of friendly banter or by know it alls

Brian: Jet fuel can't melt steal beams right guys *laughs hysterically*

Dave: No need to piss in your cornflakes mate, but you're not funny

Piss in your cornflakes by Zorkkins August 2, 2016

Pee'd in my cornflakes 

Definition 1: A reply to be used when someone thinks they have the answer to a question but another individual participating in the argument proves them wrong with a detailed and knowledgeable answer with no sympathy for the other original participant's dignity or reputation.

Definition 2: A reply to be used when someone replies to an insult or argument with a flawlessly epic one liner or put down.

Example: "You've just pee'd in my cornflakes."

Pee'd in my cornflakes by Nathan Speirs... May 16, 2010

Cornflake 

The act of drying ones jizz in an appropriate container, in order to sprinkle it onto something.

Steve totally cornflaked all over my pillow.

Cornflake by aperape March 27, 2008

cornflakes 

the crust that forms on your face after sniffing too many poppers

them poppers burnt like hell last night ive got some serious cornflakes forming under my nose

cornflakes by Messarooni August 25, 2008

cornflake 

The nasty little flakes that line your undergarments during a herpes outbreak.

These cornflakes are tickling my testicles.

cornflake by Chris Ward (Winchester, VA) March 1, 2011

cornflake 

the dry earwax in your ears

"What are you doing".
"Getting cornflakes out my ears".

cornflake by blazblu January 7, 2011

CornFlakes 

the flakiest person you know. someone you never can count on. definately deserving the title CornFlakes.

hey yo Anwar did baldemar come by and help you out like he said he was?

who "CornFlakes" that fool never showed up!

CornFlakes by plan-a-emcee October 21, 2005