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To have fun when going out, especially when dancing under disco lights at clubs/parties.

see also: get down; groove tonight
(me)That was me tripping the light fantastic with Traci Johnson at the the Spring Fling Dance Thing!
(lackey)I wish I were as cool as you. I stood by the wall the whole time and cried.
by knowledge August 24, 2004
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Original name of the second Discworld novel by Terry Pratchett. Often referred to as just The Light Fantastic
Tripping the Light Fantastic has Rincewind the Wizard in it.
by Eric July 21, 2004
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