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1.
a term for someone who's astonishingly crazy
Working here, I've seen my share of nutjobs, but this guy was mon-u-mental.
by elsquid November 04, 2010
 
2.
Something that's really amazing. See mental, sick, insane, nuts, mad, wicked, rude.
If something is mental but bigger/better
This shit is monumental! (emphasis on 3rd and 4th syllables)
by Jackie-F September 21, 2005