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1.
Superior to 'amazing'; often used when describing unbelievable, adorable, or hilarious posts on forums or irc. Used to communicate approval.

Note: this is NOT the British spelling of 'amazing', despite popular(?) belief.
1. That post about hating the colour blue was amasing!
2. My friends are absolutely amasing.
by thisfinchisblacknot May 01, 2009
 
2.
When something or someone gains mass or weight.
1] "Jughead is going to be amasing if he continues to eat burgers like that."

2] "That pile of burgers was amasing until Jughead got to them."
by Cyberout April 07, 2010
 
3.
amasing > amazing.period
omg keith, you are amasing <3
by cintaRICO August 25, 2008