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2.
An adjective describing the best possible example of any given object or situation.
This lasagna is gigitty!

Man, that concert was so gigitty!

The new Kevin Federline album is definitely NOT gigitty.
by emporium November 05, 2005
 
1.
An excited male expression used just prior to a potential or just after a successful sexual encounter.
I had sex with 2 lesbiens last night, gigitty-gigitty-gigitty
by Kyle Routledge June 12, 2004