1 definition by kclunk

Expression to describe what is occurring at your anus when in a state of extreme concern, panic, worry, or fright.

Derived from two British coins of a bygone era. The sixpence, small in size. The Half Crown, large in size.

British slang.
Bloody hell, Barry, when my main parachute failed to open I was going sixpence half a crown!
by kclunk January 16, 2021
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