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1.
Originating from the term 'afterhours.' The party that occurs after the bars close, usually circa 2:00am, usually involving techno music, fist pumping, and shots.
Dude we raged so hard at afties last night!
by Bneighbs July 26, 2010
 
2.
A stealth breed of budgie
Where the hell has that Afty gone? I knew I should have electronically tagged it...
by Elbonio May 04, 2004
 
3.
Afternoon.
Are you going to watch the game this afty?
by VAKI5 August 17, 2003