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1.
This is a good filler word when you can't think of the name of a particular object or person you want to reference.
Go into my office and grab the McGillicutty off of my desk.
by BTLS Fan September 21, 2005
 
2.
In use with ones last name, means something that you, and only you do as a specialty.
Look how Freeze sells phones, he puts his foot on their cart and does a little Freeze McGillicutty.

That sell right there is a Tommy Jones McGillicutty.
by winaFreeze December 31, 2007
 
3.
(adjective) Sometimes used in conjunction with the word "Silly", as in "Silly McGillicutty." The name comes from the old TV sitcom "I Love Lucy." References someone or something funny or outrageous.
"You Silly McGillicutty!"
by Michael D. Hafer September 12, 2008
 
4.
(Adj) Peculiar in a negative or derogatory way. Used to describe the look of clothing styles, people's appearance, or to describe material goods of suspect quality.

Coined by Bubba the Love Sponge they have never outright defined the word but used it regularly in early-mid 2006.

(Noun) Useless Junk.
(adj)I like number 124 but I'm a little distracted by the wood panneling Mcgillicutty Jones in the background.

That old hefer was showing some flabby Mcgillicutty puss on the backside.

(noun)Don't be coming in here trying to put over that Mcgillicutty.
by expane December 21, 2006