(From SE Asian 'New English'.) When one's offer of help has been
rebuffed, to
take offence and thereupon actively endeavour to
worsen a situation (out of spite).
I tried to help
Brian out, but he was just really rude to me. So I decided to break my finger (off) in his butt.
If he doesn't
appreciate all my advice and
hard work, I will just break my finger (off) in his butt.