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The act of masterbating without an erection.

or for girls;

The act of masterbating a guy who doesn't have an erection.
"Oh man, I did a slinky jerk today but stopped when I got a hard on. I have control".

"Dammit Jacob, whats wrong with your penis, I don't want to slinky jerk, you're on your own".
by Justin_Ley October 02, 2006
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