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1.
An expression of shock or disgust
Russian Tour Guide: "And on the right we have Rasputin's pickled penis"
Random guy in crowd: "Yurk"
by o_O May 23, 2004
 
2.
To throw up violently, typically following a night of heavy drinking.
After taking down that 5th shot, I had to yurk for like 10 minutes before I could continue drinking.

by Bels April 23, 2007
 
3.
Yurk: describing the feeling of cuming. it can also be the actual jiz itself
Usually when I eff her, I am like Yurk, but last night was soo good, I was like Yuuuuuuuuurrrrrrrrk.
by Jon June 29, 2004