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When someone forgets there Jam (favorite song).
Danny: You forgot your own Jam?
Brian: I had Jamnesia
by vobman July 29, 2015
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Jan 18 Word of the Day
1. Blue Monday is the most depressing day of the year, calculated by Dr. Cliff Arnall, a researcher at the University of Cardiff's Center for Lifelong Learning.
Factors used to calculate the date included weather conditions, debt level, time since Christmas, time since failing our New Year's resolutions, low motivation and feeling the need to take action.

In 2005 the date was calculated as January 24th, in 2006 it was January 23rd, and in 2007 it was January 22nd.

2. A song by the hard rock band Orgy from their album Candy Ass.
1. Guy: "Aw man, I feel like absolute shit today."
Friend: "Yeah, same here. I hate Blue Monday."

2. "I wish I could sing Blue Monday to my ex-girlfriend, she's such a bitch."
by L_Roku August 31, 2007
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2
In the sport of roller derby, at the end of a jam, when a player skates back to the bench and can't remember a single thing that just happened on the track. Caused by a combination of nerves, adrenaline, overload of quick, in-the-moment decision-making and whatever you call that thing your brain does where it represses things that are painful.
"WTF just happened out there? I have wicked jamnesia! Who got lead jammer? Why is our jammer in the box? Did I do anything good? Who was my partner? HEELLPPP!?"
by KittyT February 25, 2011
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3
forgetting the words while jamming to a song...amnesia+jam
"Dude I thought you knew all the words to Firework?"
"Hold on bro, I'm having jamnesia"
by hhgregory July 11, 2015
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4
When you forget what you jam is called.
Partyguy #1: What's my jam called again. Oh yeah, Fantasy that shit's my JAM!1

Partyguy #2: You forgot your jam?

Partyguy# 1: I have jamnesia.
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5
When you can't remember the name of a song or band
"What was that song called?...Fuck! I think I have jamnesia
by Jake5422 July 28, 2015
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