Fillabuster-To shoot a cop. 'Filla' is another way of saying 'fill a', and in this context, it can be assumed the speaker means fill with bullets. 'Buster' refers to how cops call arresting someone busting them.
"One of the cops hit Buzzy when they nabbed him, and he wasn't resisting or nothing. So we're gonna go fillabuster."
by NTYT January 18, 2006