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2.
When your asian teacher decides your homework isn't due until a few days later.

Often after a rant about the ungle of arpha (angle of alpha - i think?)
Student: When is our homework 5 due?
Wang: Oah - Homewuk 5 hars bean postphoned until next Monday.
by Email from today February 20, 2007
 
1.
A verb meaning "to put off a phone call until a later time."
I know you want to talk, but the plane's about to take off. We'll have to postphone.
by Snerko November 15, 2010