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1.
Adj. (mat-TAS-tik) The state of being more than generally fantastic, and much better than great. Rather like wonderfull, with a green tint and earthy smell about the person or object.
A few minutes after waking up, Robb felt pretty mattastic."
by Robbisms October 25, 2010
 
2.
to be very good at anal sex
Wow that matt kid is very mattastic!
by lerby June 14, 2008