To police, or to patrol like a policeman. Back formation from constabulary and constable (Police station and policeman, in Great Britain)
The Wire, S01E07:
Omar said 'lf l was hunting Mr Bird, l would consider
the bestpackage to be the red Dilly that's over there in Carrollton. That's if l happened to be *constabulating* like y'all.'
(Constabulating = continuous form of constabulate, an intransitive, dynamic verb)
I just came home from a long day at work. The house is a mess, dirty floors, dirty dishes, how did the fly get in here? The newspaper is spread all over the rug, the dog is barking at me, the kids are yelling for dinner. Please everyone! Give me just a moment to get contabulated!