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When you nut so hard from hacking off that you tense up and throw your neck backwards and give yourself a mild case of whiplash.
Damn bro my neck is killing me. Did you jacklash yourself again? Yea damn near put my head through the wall this time.
Jacklash by Dick Onchin November 12, 2020
Related Words

Jackashay 

A Girl that is bipolar as fuck, has no filter when it comes to being fruity, has and extremely small cycle, and everyone thinks she's soft until her patience run out.
Look at that girl right there she's most definitely a Jackashay.
Jackashay by Jayywayy the goat December 17, 2018
The realization by mainstream media that Jack Thompson, anti-video game violence lawyer, is a senseless, irrational, babbling fool; began after Thompson claimed that the Virginia Tech gunman Cho Seung-Hui played Counter-Strike, despite the fact that no information about the identity of the gunman had been released at the time to remotely suggest this. Coined by gaming website Joystiq.
Jack Thompson suffered Jacklash from the media, including Chris Matthews and MSNBC, after riding the tragedy at Virginia Tech for a cheap political agenda.
Jacklash by Blue Monday April 30, 2007