A non-existant ten pound note, which is used for the purpose of online wagers or bets with others; where there is no intention of money changing hands regardless of the outcome.
The phrase originates from the online UK motorbike forum 'Visordown', specifically a user called 'Soapy' known for making bets with no intention paying anything.
Your name is xxx and I claim my Soapy Tenner.
A Soapy Tenner says you are wrong.
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