particles of food left floating around in your drink after you have taken a sip after swallowing your food or while chewing your food.

Originated in the Central American country of Belize as part of the kriol (creole)(broken English) language spoken there.
Kriol dialect as spoken in Belize.

Dan: "Gimme some a yo coke, mi bally"

Tony taking a look at the pint seeing bread crumbs floating around in the coke

Tony: "Buay, i no tink u want drink some a mi wash-back weh di inya"

English translation

Dan: "Let me have some of your soda, pal."

Tony: "I don't think you want to drink from my soda with wash-back food particles floating around in here."
by ThirdWorldTony September 3, 2009
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The transfer of saliva and/or foreign substances from one's mouth through a liquid medium.
Melissa's soda has back wash in it, so i do not want it again!
by Prodigi January 19, 2009
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back wash is when someone drinks out of a bottle or container that more than one person is drinking from and pour some of the beverage from their mouth back in, or the worst part Saliva/spit, or really be both. thats why everyone needs to pour their own glass. and dont let your kids drink out the juice jug. can cause hiv and aids if someone is infected. etc anything like that.
dont back wash, everyone has to drink that.
by Megasus Thrist Jesus Christ April 22, 2022
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1.some freak'o crap who's so freaking lame in giving ud.com definitions

2.lame brain
oh, look at me! im back wash! im so lame, i can't even spell my name!
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A person who enjoys eating shit out of someones asshole or mouth
Shut up you back wash bitch, your nasty
by Joe jeffries May 31, 2008
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