A sound representing a quick, sharp movement or dismissive gesture, often used to indicate something is easy or done without effort.
This is modern slang/informal interjection, likely influenced by similar sounding words and onomatopoeia. It gained popularity in internet culture and contemporary casual speech.
'Bish' is one of the newest words gaining ground in English slang—it's becoming a sound effect for 'boom, done!' or 'dismissed!'—showing that English is constantly creating new interjections to match how young people actually talk and gesture online.
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