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1) The event used to describe when the threshold of creativity has been crossed over into insanity

2) The event used to describe the exact moment that started a downfall.
When Arthur Fonzerelli jumped the shark, that was Happy Days' "Hair on fire" moment.

When Indiana Jones survived when the Soviets nuked the fridge, that was the series' "hair on fire" moment.

When Micheal Jackson's hair caught on fire during a Pepsi commercial, that was his "hair on fire" moment.

When Battlestar Galactica swept the pigeon, that was their "hair on fire" moment.

When Soulja Boy released an album, that was rap music's "hair on fire" moment.

When Axl Rose substituted Slash with Paul Tobias on guitar for Guns N Roses after 1993. that was rock music's "hair on fire" moment.
by josejr226 July 16, 2009
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2
A state of being super busy or overwhelmed. When your hair is on fire, you are consumed with reacting to an emergency and have not time to deal with ankle biters.
It was one of those hair on fire moments where everyone and their brother was requiesting things from me at the same time.

Do you need help? it looks like your hair is on fire.

I am sorry I didn't call you back; my hair was on fire at work.
by RCU December 04, 2014
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The vengeful act of crapping on a lover's chest while they sleep.

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