Top Definition
National tripping day. Humans are known to turn into gods for a period of up to 12 hours on this day. Started in 1943 with Alfred Hofmann's incredible experience, April 19th is usually partaken by people who *don't* just use drugs to get high.
Voyager: Dude we're dropping sunshine tonight!

Skeptic: Uhh... why? I've already bought half an ounce of weed for tomorrow.

Voyager: Forget about that, it's April 19th, bicycle day!
by Dr. Hofmannfan January 27, 2010
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