1. Derived from the film 'The Matrix' when the guy hell moves really fats to avoid an oncoming bullet, a matrix occurs when you do something really sneaky without anyone else noticing to avoid insult or injury. It is also similar in meaning to the word, 'smooth'.
*derek ditches a brick at paulies head, but Paulies ducks to avoid it*
Derek: Whoa man! you just fully matrixed that brick!
*Paulie steals Dereks dildo from right between his arse cheeks without him noticing*
Derek: You fully Matrixed that dildo from right between my arse cheeks!