backwash – v. to take a mouthful of drink from a container (cup/glass/bottle) and spit it out back into the container in which saliva and bits of food go in with the drink.

Ex. Someone eats a carrot sandwich and becomes an arsehole by taking a mouthful of their mate’s drink from their cup and spitting it back in which bits of bread and carrot go into the drink with saliva

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