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1.
A feeling of laziness following a large lunch where your failure to eat moderately results in a complete failure of will power.
OMG, Lunch Coma. Coffee?
by scolen2 March 04, 2008
 
2.
Passing out after lunch or other meal due to slow digestion.
Due to poor digestion, she was unable to resist the lunch coma that put her in the supine after both lunch and dinner.
by Pamelot May 22, 2010