It's taken from gangster slang and he's saying "my driller". Driller meaning shooter. So he's saying my shooter or his best friendbasically, someone who would shoot someone for him
It's like he's still here. He deserved so much more. Fly high ma drilla. Oh jeepers TITAN HOLO TITAN HOLO TITAN HOLO VAS VAS VAS VAS VAS VAS VAS OH OH OH OH UGH HES STILL ALIVE?
A roadman who has a bullet propelled weapon and shoots people. Used mainly in the boroughs of London. The terminology is often implemented in dialogue between gang's and gang members.
My Drilla, Drillas, What you saying drilla, My young g's are savage they gone drilla your face, R Skeng is some mad drilla with his spinner