To experience flashing, unrelated images in frequent succession whilst in a spasmic state, such as having an orgasm or having a fit (often drug related).
by Ze|ane November 4, 2008
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Portmanteau of phantasmagoria and orgasm
indicates a euphoric psychedelic experience
LSD always seems to cause the best phantasmagasms
by iamslegend233 June 11, 2013
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