The mental effect of realizing that a basic assumption of your entire life was wrong from day one, usually resulting from a totally new thought, comment, or experience that flies in the face of everything you currently know.

See also; mindfuck.
Mental whiplash is the psychological equivalent maxing out your revs in Third, and then accidentally shifting into Reverse instead of High.
by Downstrike October 23, 2006
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A painful spasm felt after nearly being caught wanking, the actual pain is felt when one pulls their hand back from their cock and their shoulder is strained by the sudden movement. A good way of preventing this from happening is to stretch before masterbating or simply locking your door.
Person A - Hey, why's your arm in a sling?

Person B - Last night i thought i was alone in the house, so i had a wank. Midway through i heard my mum come up the stairs so i paniced and... (points at arm) this happened.

Person A - Whoa... Wanker's Whiplash... You should have limbered up first.
by Anonymous #924876 January 19, 2010
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A sharp pain in the neck caused by headbanging.

A synonym for terms such as Bangover and Mosh Neck.
Metalhead 1: Man I got a serious pain in my neck from the (enter band here) show last night.

Metalhead 2: Sounds like you've got a case of Headbanger Whiplash.
by Mr. MmmBongo August 19, 2011
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an extreme, rapid series of emotions that leave everyone involved including the person who is experiencing the emotions confused, disoriented and/or confused
Becky went from calm to sobbing to gleeful to pissed to dispondent all in one day. This frustrated and confused her parents, friends and Becky herself. They experienced moodswing whiplash.
by lfc3457 December 13, 2009
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The experience of suddenly realizing that something is the opposite of what you thought it was.
"That's adorable!" I thought, watching a baby bear squeak with frustration as it tried to pull the bark off a stick. Then after a few minutes I realized the stick was a rabbit, and the squeaks were from it being eaten alive. The reality whiplash literally knocked the wind out of me.
by TheAwfulDin December 2, 2014
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That abrupt and jarring return to work following a vacation break.
I just returned from an amazing trip on Sunday evening, and this Monday morning I am experiencing a severe case of vacation whiplash at work.
by Spotted Zebra July 18, 2023
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Whiplash of the ass

From Futurama season 2, episode 11: "The Lesser of Two Evils"
Bender: I think I got whiplash!
Leela: You can't have whiplash, you don't even have a neck.
Bender: I meant ass whiplash!
by yumyumgopop November 22, 2015
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