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1.
A term created by two guys, "Leon" and "Slicer". The term is defined as, "A misspelled term from pressing the wrong key on the keyboard when actually referring to "Yarly" in an argument.
Dude: I had sex with your sister last night.

Dude2: ORLY?

Dude1: YARKY!

Dude2: WTF
by slicer91 February 20, 2011
 
2.
Of an unpleasant nature.
The weather forecast tomorrow looks yarky.
by Samantha Smith August 10, 2006