Busier than a one-legged man at an arse-kicking competition
Extremely busy, with no hope of keeping up.
Person 1"How was the Christmas rush?"
Person 2"Busier than a one-legged man at an arse-kicking competition."
You'll also hear
Busier than a dog with two dickssame meaning
Busier than a one-armed paper hangersame meaning
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While you're here
Extremely busy. Can be sarcastic about someone who isn't busy at all.
Extremely thirsty. Also used for weather that has not seen rain in months.
Completely full, usually after a big feed. Sometimes used for very drunk.
Showing off and very pleased with yourself.
Almost impossible to find.
Extremely happy.
