1 definition by SomeGuyBroDudeCollege

Top Definition
A slang term for ecstasy. MDMA is crushed and put into Cold FX capsules, where it is disguised as cold and flu medicine. Originally a trick to get people to take ecstasy, but was eventually adopted as a slang term for the drug. Also, a bottle of Cold FX is less conspicuous than a baggy of your favourite shit.
Guy 1: "Aw man, I'm not feeling too well, I think I have a cold..."

Guy 2: "No problem, just take this Cold FX"

Guy 1 trips
by SomeGuyBroDudeCollege June 21, 2010

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