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1.
An expression of surprise, dislike, disgust, happiness, or pretty much anything else.

Situations that are particularly unique can be referred to as beughity beugh, beughocracy, or beughocratic.
You didn't see Mike Vick's comeback against the Giants? Beugh, man, that shit was crazy.
by J-Smoove January 31, 2011
 
2.
A word said in extreme disgust or dislike
Friend 1: "I have to fucking work all day."
Friend 2: "Beugh! That sucks..."
OR
Friend 1: "Daaaamn, look at him!"
Friend 2: "Beugh! Are you fucking blind?! That guy is naaaaassty!"
by Katie <3 February 15, 2006