Top Definition
When someone forgets there Jam (favorite song).
Danny: You forgot your own Jam?
Brian: I had Jamnesia
by vobman August 29, 2015
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
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 30, 2015
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.
by Morgan Freeman's evil Piñata. September 16, 2015
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 August 29, 2015
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.