I was watching a video and a person in it said:
'My mum said if I killed myself to do it on my time, not hers.'
I don't really get what it means. Her mum wants her to kill herself after she dies? Is 'on my time' good grammar? Just wondering.
She is presumably doing working for her mother (either formally or informally, I can't say from the excerpt).
That is to be "on the mother's time."
When she is not working for her mother, then she is on her own time.
The mother is jokingly telling her daughter to finish her work before she kills herself.