ha ha koo nish nish - A Japanese phrase that means you’re old and trying too hard,

A Japanese phrase that means you’re old and trying too hard, like when you wear a wig and say 'ha ha koo nish nish' in a karaoke bar.

My uncle wore a wig, a headband, and said 'ha ha koo nish nish' at the karaoke bar.

She pulled her eyes so hard they looked like they were about to pop and said 'ha ha koo nish nish.'

He said 'ha ha koo nish nish' while wearing a fake mustache and a headband.