I believe the phrase was used in london upto the 1960's as a cryptic way of saying to go (outside) to the toilet. Upto the 1960's most pubs and many houses had outside lavatories. The speaker may not of course have arrived by bike.
Is this definition correct.
Learn English – derivation of the expression “I am just going out to turn the bike round
idioms
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Best Answer
Turn my bike around appears to be a phrase originated in pub culture:
(www.definition-of.com)
also: Turning the vicar's bike around:
From Loophemisms: