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1.
What you say to someone when, without their knowlege, you steal something from them.
The individual is in a store and asking the clerk something while putting something else in their back pocket or bag. When the clerk responds the individual replies with 'ganx.'
by JasonP October 10, 2006
 
2.
Someone who is completely out of it.
After a long nap. After drinking yourself to death. When you make a stupid comment.

Damn Billy is hella ganx for that comment he just made.
by KUKU"SNEST August 26, 2010