Green’s Dictionary of Slang

1. emotional intensity, usu. depressing.

1974

J. Lahr Hot to Trot 196: I never make the unpardonable sin of feeling emotion. Fucking is like peeing. It’s relieving yourself. Nobody wants any heavies.

2. (N.Z.) threats.

1982

H. Beaton Outside In I i: They all have to come to you. The Boss! But you’re startin’ to be a bore. So piss off with the fuckin’ heavies, ’cos you don’t scare me.