Vulgar British slang meaning to masturbate. Direct and crude, it belongs to the same family of blunt British expressions as 'have a wank' or 'knock one out.' The verb 'bash' lends it a rough, unrefined energy. It is used almost exclusively in informal speech or comedic contexts and is not considered polite in mixed company.
He'd been in the bathroom long enough that his flatmates started making jokes about him bashing one out.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(slang, vulgar) To masturbate.
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