Green’s Dictionary of Slang

heavy v.

[heavy adj.]

to threaten, to menace.

[UK]J. Barlow Burden of Proof 134: You can’t tell these days. People are being heavied.
[Aus]Hackworth & Sherman About Face (1991) 200: The sergeant started to heavy me, but then my boys stood up.
[Aus]G. Disher Deathdeal [ebook] ‘Some inmates tried to heavy me’.