to apply oneself conscientiously to
one's work.
it is similar to the idiom of keeping your nose to the grindstone in both meaning and logical origin (or lack thereof). Essentially, it is the 'grindstone' saying adapted to the 21st
century, and more specifically applies to the elimination of
procrastination tendencies, i.e. do work son.
Brennan: Damn
fool, I wanna get keyed off that purp, but i got homework to do.
Scott: Bro, just put the silicon to the titties and hit me up when you're done
Brennan: Dopeskeet.