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1.
The patch of hair that generally trails down a mans abdomen...trailing downward leading you to "the goodies".
Hence - Goodie Trail
The definition is fairly self explanitory... however... take a look at some examples of goody trails on the internet if you need a visual... just use a few key words, and viola!

Used in a sentence: His goodie trail was sexy!
by Chi Town Susan November 06, 2007