Drillings are man who are not worthy enough to have the drilla title (trp). Drillings can be promoted to Drilla by another Drilla who has recognised an act of worthiness.
A “Drilling” the act of someone “gooning” (where someone is too fried)
And you proceed to fuck with them as in making gibberish noises to them, saying (e.g person) knows and making them second guesseverything and tweak out.