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1.
nasty, horrible, disgusting
urgh, i had to open the window, cuz the car smelt gacky as fuck
von mikepacker88 14. Oktober 2007
 
2.
something that makes you gack, often yucky
the food was gacky.
von Pookett 18. Mai 2007
 
3.
a nickname for someone that does meth. from the word "gacked"
hey gacky, are you gacked ouy today?
von S. 22nd street 18. Oktober 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!
von mez05 19. September 2006