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2 definitions by Robert Harris

 
1.
A sexual act which involves licking a woman from the top of her ass-crack all the way around to her belly-button, or vice versa.

Can be abbreviated as a GCT.
That girl is so hot!! I'd like to take her Grand Canyon Tour!!

Last night, I took a GCT with my girlfriend.
by Robert Harris April 30, 2004
 
2.
A glorified or emphasized version of "yeah right".

a word to ignore or pass off something someone said to you as B.S.
"When my manager asked me to work late on Christmas Eve, I looked at him and gave him a giant 'yatz'!!"

Tim: "Hey Rob, I think that weed-wacker has more horse-power than your car."
Rob: "Yatz."
by Robert Harris April 26, 2004