The onset of rapid uncontrollable muscle spasms of the legs (foot tapping) usually to dance music, after a night of MDMA.

This can last up to several hours depending on the strength of the MDMA and the bass (can also occur whilst sleeping).
When attending a recovery session (usually occurs on a Sunday morning after a night of MDMA consumption), pay close attention to the floor where you will bare witness to the phenomenon of 'Turbo Leg".
by Regular victim of Turbo Leg April 09, 2012

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