1 definition by Captain Rathbone

To laugh out loud.

Derivation: Believed to have evolved from the more popular

L.O.L. 'Spring Roll' --> 'Spling Lol' --> 'Spling'

Often used as graffiti on official parking signs in London, rendering them invalid - AKA "Rathboning"
by Captain Rathbone November 5, 2010
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