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1.
The overstuffed feeling you get after eating at one of those Brazilian rotisserie joints
Waiter - Would you like to look at the desert menu?

You - No man, I've got a meat ache!
by STAdefZeph November 02, 2010
 
2.
A headache from over consumption of meat. e.x: Eating a triple big mac and triple baconator at one sitting
"Holy crap I have such a terrible meatache right now"
by HaloSamurai January 14, 2012