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Buang is a Cebuano word for crazy. Cebuano is a local dialect in the Philippines. Buang is typically a harsher word than crazy. This can be used as a curse when you are angry and can be used in tandem with other known Cebuano cuss words such as the likes of Yawa, Pisti and Atay.
Normal Usage:

Buang ka = You are crazy.

Cuss Usage:

Yawa man diay ka, buanga ka. = Roughly translates to: You fucking evil, crazy asshole.
by Sharkybyte April 01, 2008
it means "crazy" in cebuano or something..
"you're so buang", "your mom's buang".
by l0000ser September 29, 2007