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."
For about 9% of the very same population, the matrix is reality.
For the rest of that population, the matrix is a two-dimensional array.
Outside that population it's a Scifi/fantasy movie.