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1.
Any word used to replace the name of the source animal of a meat with it's euphemistic title, such as "Beef", or "Pork" as opposed to "cow" or "pig".
"Would you like the chicken, fish, or beef entree?"

"What's a beef?"

"It's a meataphor."
by VocalVegan July 06, 2009
 
2.
The replacement of one meat with another, usually at a breakfast restaurant.
Hey! The waiter replaced my bacon with ham without even telling me, and right here, the menu says "no unannounced meataphors!"
by iamtheram August 05, 2008