1: To not have memory.
2: A nescesity in most ConsoleRPG's; you can always tell a game will be good if the main character has amnesia.
Fei, Cloud, Squall, and many more characters have had amnesia, for the purpse to hide their intruiging pasts until it would best impact the plot to reveal it.
The use of this dances the border between clever and contrived.
A loss of memory, either temporary or permanent. The amnesia could be during a certain time, or perhaps your entire life, but that'd suck, wouldn't it?
"Dude, if I loan you this twenty dollars please pay me back. Don't come down with a case of selective amnesia on me."
By Joannes
Post-Amnesia
(noun) - When someone makes a comment regarding a post on Facebook or tweet that you completely forget about.
Jody: So did you end up all wet this weekend?
Chuck: Excuse me?
Jody: Yeah you facebooked it was raining at your cabin.
Chuck: Ohh riggghhhhttt... Sorry, Post-Amnesia
By Juliet
Nostalgic Amnesia
noun; a state of mind where one experiences a pleasant glow due to a combination of reminiscences of a past time, and completely forgetting how rubbish that time was whilst you were originally experiencing it.