it's someone's funeral

be (someone's) funeral

A (usually humorous) threat indicating that if someone does or doesn't do something, it will bring about negative consequences. OK, fine, don't do what mom said. It's your funeral! If Billy goes in my room when I'm not here, it'll be his funeral.
See also: funeral

it's (or that's) someone's funeral

used to warn someone that an unwise act or decision is their own responsibility. informal
1996 Amitav Ghosh The Calcutta Chromosome I'll turn a few pages for you; but remember, it was you who asked. It's your funeral.
See also: funeral
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