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1.
A person that is intelligent, but not liked by those around them.
"Do you see that guy over there"
"Yeh"
"He's a Mattais"
by Kolilp May 04, 2009
 
2.
A person of great intelligence, with their own sense of humor.
A person who is always trying to help, but still gets the shit end of the stick.
Jim: "Mattais helped me clean up after the party"
Sadie: "Pshh, he probably made the mess anyway."
by sunbitch November 04, 2011