Quote:
Originally Posted by garinda
Have you heard it though?
I thought afterwards it might just be a family saying, to do with bread.

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Yes, frequently G.
It was used by both my parents and my G'parents....and in the context you used....although it was also used if someone was very het up about something, angry, upset, argumentative.......they were said to be 'on top do'......now we use top note....and that is why I think your derivation was correct.