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2.
to be very good at anal sex
Wow that matt kid is very mattastic!
by lerby June 14, 2008
 
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