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1.
Originally meaning a random series of events or figures in a fantasy or dream like state.
Used now to define a night out, normally substance fuelled, that leads to lot's of strange, weird, wonderful and damn right crazy things taking place around you as you try, and fail, to make sense of exactly what is going on.
Man, last night was fucked up, as soon as we hit the club and I came up the whole thing became phantasmagorical. What the hell was that swedish dwarf doing on our drive with andrex tissue hanging out of her pussy?
by J. Man May 19, 2005
 
2.
Adj.) Being completely and utterly awesome to the point that if you were any more awesome you would internally combust and take a crap in your pants at the same time
Holy crap! Did you just see that guy explode?! He was way past phantasmagorical!

I think it would be phantasmagorical if a 200 lb. bottle of soda could just come over here and rape me in the glutes.
by UncleBobbyBee May 04, 2010
 
3.
something which is absolutely fan-freakin'-tastic!the only night ever worth remembering in the history of ever,pure greatness.
wow dude,that blink concer on the 31st of august 2010 was PHANTASMAGORICAL!
by austin aries August 30, 2010
 
4.
All the creepy, scary words you can think of put together. From Lemony Snickets a Series of Unfortunate Events, Book 3, The Wide Window.
In front of the cave there was a sign saying for sale, and the orphans could not imagine who would want to buy such a phantasmagorical place.
by Brigid May 03, 2004