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1.
What Chicago White Sox fans do when Bobby Jenks comes into the game in the 9th Inning to close it out
"Dude we're up 6 to 5 going into the top of the ninth. I can't believe how hard I'm Jenking Off right now".
by hedup34 May 01, 2009
 
2.
Jenking off is the act of taking a big whiff of jenkum before jacking off, using the left over sewage from the jenkum bottle as lubricant.
I heard Steve jenking off in the bathroom at school.
by School Wizard February 08, 2011