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1.
Short for "Woo Woo Woo, You Know It!". The full phrase is the catchphrase of WWE superstar Zach Ryder. The initials are a rallying cry of his fans, similar to WWJD (What Would Jesus Do).
Zach Ryder for World Heavyweight Champion! WWWYKI!
by TheBaldOneMpls October 28, 2009
 
2.
Short for "Woo Woo Woo, You Know It!", the catchphrase of WWE superstar Zack Ryder.
Non-Broski: I see people write it "Zach Ryder", isn't it "Zack" with a K?
Broski: WOO WOO WOO- YOU KNOW IT, bro! WWWYKI
by Mr Funny December 06, 2013