The sediment and/or particles of whatever you're eating that ends up in your drink.
William- "Hey Sven, what are those floatin' things in your cup of Perrier?"

Sven- "Just some backwash of water chestnut and sesame"

William- "Why on gods green earth were you eating water chestnuts and sesame seeds?"

Sven- "I.. dont.. know..."
by The_Buddy August 18, 2011
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When a girl washes your back in the shower.
Girl: Hey can I hop in the shower with you ;)
Guy: Yeah it's been a while since I had a good backwash.
by superkang December 9, 2010
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A George W. Bush supporter characterized by drooling, religious fanaticism, racism, homophobia, hate of others and self, ignorance, and an inability to think for themselves, with the intent to destroy anything or anyone different than themselves.
So, Mr. President, pay no attention to the people that say the glass is half full. 32% means the glass -- it's important to set up your jokes properly, sir. Sir pay no attention to the people who say the glass is half empty, because 32% means it's 2/3 empty. There's still some liquid in that glass is my point, but I wouldn't drink it.

The last third is usually backwash.
by openedsource April 30, 2006
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A term that defines a person who has dated an unimaginable amount of people, usually all in the same social group. The term is used because of the similarity between the feelings towards drinking your friend's backwash and dating your friend's ex.
Also known as the second-hand spouse.
"So on Friday I'm going on a date with Evan."
"Girl, I wouldn't even TOUCH that guy. He's a major case of backwash."
by S J Thomas May 22, 2008
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When you come inside a females orifice (preferably asshole) and proceed to suck it out with your mouth.
I heard that Nicolas was backwashing Jennifer's asshole last night.
by RaginAsian0 March 15, 2017
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When you suck a guys dick, and you hold the cum in your mouth and then exchange it back to him through a kiss.
Damn that backwash cum tasted so good after last night.
by 0dharpsand0flats November 27, 2019
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