Top Definition
Semen, specifically that of which is the result of fellatio. The use of the word is most effective around the holidays and in fall and winter. Neck Gravy is a bit too heavy and rich for hot weather.
"She gave me a blowjob and got a bigger helping of Neck Gravy than she expected."

"There's nothing wrong with that throat that a good dose of Neck Gravy won't cure."

"Pass the neck gravy, please."
by Poop S. December 21, 2005
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