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1.
nasty, horrible, disgusting
urgh, i had to open the window, cuz the car smelt gacky as fuck
автор: mikepacker88 14 октября 2007
 
2.
something that makes you gack, often yucky
the food was gacky.
автор: Pookett 18 мая 2007
 
3.
a nickname for someone that does meth. from the word "gacked"
hey gacky, are you gacked ouy today?
автор: S. 22nd street 18 октября 2006
 
4.
uncoordinated, unco, sloppy, as in when running.

also used to describe something that is gack-like, gooey, sloppy.
hey man, i suck at running. i'm so gacky.

ew that's gacky!
автор: mez05 19 сентября 2006