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1.
1940s-50s upper midwestern slang for penis.
Joe and Mike were peeing off opposite sides of a bridge. Mike wanted to brag about the size of his jinker, and said to Joe, "This water sure is cold." Joe, not wanting his jinker to be underestimated, replied, "Yeah, and deep."
by Dr. Beckenstein September 21, 2005
 
2.
1) To find out in shock or aww.
2) find out the hard way and be surprised
3) Scared out of your pantaloons
1) "gosh jinkers why dint you tell me earlier"
2) "jinkers should have told me befor"
3) "jinkers im scared"
by Rezewski January 06, 2006