something better than good, just below amazing
you're getting me a drink? fantasmo!
by hayley, cambridge October 11, 2003
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 13, 2008
A commentator for his own Modern Warfare 2 gameplay on youtube. He is as funny as shit and refers to his viewers and fans as 'his nuggets.' He plays free-for-all and is famous for his 'killstreakless' nuke videos.
Mister Fantasmo-"Whats up my nuggets! Mister Fantasmo here."
by xhaphanus June 28, 2010