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1.
the time of the day that is after 1 o' clock pm
this is the realistic definition
12 o' clock is the technical one
but this is the realistic one
i hate when it becomes the afternoon aka 1 o' clock pm
by Maliza Sherotool November 24, 2007
 
2.
a combination of day, which means "yea right", and fuck off. It also can be pronounced "Afternoonation!" and is said quickly in a chinese accent.
Kangaroo Laura Nutella: you're crazy!!

Roubs: AFTERNOON.

Sir Dimitrius: I love the shit out of you
Amazing Lauda: afternoon.
by Donning Laulau (D.B) May 04, 2010