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1)<noun>(in hotels) a system of paying a single daily rate that covers the room and all meals.

2 )<slang> used as a defying statement to say. I like american stuff so keep your foreign food away from me. ( usually said by a non adventurous person who order pb&j in an indian restaurant.
"Listen buddy im here on the american plan. I live on an american base, i eat in an american mess, i shop in an american px"
by Theamazinggeek May 08, 2018
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