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1.
Derives from the latin language... meaning, with (highest) honor
One may receive this phrase on a diploma from college.
by joker March 11, 2005
 
2.
The act of two floor hockey sticks vigorously attacking one another on a school gym floor. On occasion, the weilders of the sticks will shout the name out as a battlecry before/whilst and after the act.
"Today, some turd named *insert name here* decided that we shall perform the act of summa cum laude right in the middle of the gym floor."
by Nick Melanson February 20, 2008