When a man has an erection and discretely hides it by pulling a
"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.
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.