Usually combined with "go" in the present tense or "went" in the past tense to describe an unbelieveably cool or Matrix-style action. Sometimes involves quick reflexes (usually in dodging or blocking things), or violence.
"Dude, stop fucking around or I'll go Matrix on you."
"That was so Matrix when you dodged that hot dog."
"Matrix." This move consists of the classic Neo backwards arch while a hand of preference slides into one's pants and flips the erect penis upwards into its natural position. The penis is then trapped between one's stomach and the elastic band from underwear.