Neckflash (verb): To neckflash, is to be in such a hysterical laughter fit that you lift your head back and flash your neck to the world. The average neckflash only lasts for about 5 seconds, however the world record is at about 6 seconds.
Yesterday while I was talking to Eugene, I neckflashed like 13 times.
When your neck gets really sore from sitting in bed all day/night watching Netflix on your laptop. Its caused by the awkward positions you sit in so you can see the screen while trying to binge watch your favorite shows on netflix. The only way to try an prevent it is to constantly change positions.
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Person 1: Whats wrong with you?
Person 2: My neck is killing me! I have a really bad case of neckflix from binge watching House of Cards all night