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1.
Exclaimation of dismay, commonly used, and originaly created by the Peanuts gang by Charles Schulz. Used frequently by Charlie Brown in the following situations:
Losing a Baseball game
Having the football pulled away by Lucy
In an embarrasing situation

Is used also by other members of the peanuts gang and can be used as a roaring sound to scare someone.
1)
Linus: I told her about how you're madly in love with her,
Charlie Brown: Aaugh!!

2)
Snoopy: It's not the things that go 'bump' in the night that scare me. It's the things that go 'AAUGH!'
by Jackami March 09, 2010
 
2.
1.) What Charlie Brown yells after missing kicking the football; after losing another baseball game; after getting his kite stuck in a tree; etc, etc.

2.) Express a feeling of disappointment or displeasure.
Charlie Brown is such a blockhead, AAUGH!
by lucy van pelt October 03, 2009