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2.
Past tense of "to gack", meaning to cough up a hair ball. Named for the sound a cat makes while doing so.
My cat gakked on the sofa.
by Dave42 October 13, 2005
 
1.
Blog-speak meaning you have stolen and idea from someone else.
I gakked this meme from Nina.
by kyria January 14, 2004
 
3.
ADJ In a state of great excitement and euphoria; in a state of happiness and satisfaction where you are not completely aware of your surroundings; a dream-like state
caused by a surprise or positive news\event; NOT BY mind-altering drugs or alcohol
He was so gakked after winning the concert tickets on the radio, he forget to realize he forgot the concert date after he got off the phone.
by keyshawn632 September 23, 2003