Green’s Dictionary of Slang

1. a phr. expressing doubt or disbelief in the previous statement.

2003

McGill Reed Dict. of N.Z. Sl. 120: kick her/it in the guts 1. Expression of doubt; eg ‘Ya reckon there’s gold in that creek. Kick her in the guts, mate. I didn’t come down in the last shower.’.

2. a phr. advising someone to be tougher.

2003

McGill Reed Dict. of N.Z. Sl. 120: kick her/it in the guts 2. Advice to be more aggressive, perhaps use brute force to get an activity or machine underway.