Top definition
something better than good, just below amazing
you're getting me a drink? fantasmo!
by hayley, cambridge October 11, 2003
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2
a word describing anything that is extremely fantastic, to the point of almost being orgasmic
Tina: look at that guys butt!

Henrietta: I know, thats the most fantasmo butt I've ever seen...
by sleepy_mexican March 12, 2008
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