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.