Daily entries from the 17th century London diary
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The umbles are the liver, kidneys, and other portions of the inside of the deer. They were usually made into pies, and old cookery books contain directions for the making of ‘umble pies.’
Umbles \Um”bles\, n. pl. [See Nombles.]
The entrails and coarser parts of a deer; hence, sometimes,
entrails, in general. [Written also humbles.] —Johnson.
Humbles \Hum”bles\, n. pl. [See Nombles.]
Entrails of a deer. [Written also umbles.] —Johnson.
http://dict.die.net/umbles/
Umbles; heart, liver, entrails of a deer. Alternative spelling for numbles. OED.
The word gives rise to the expression “to eat humble pie.” ie to be humbled or humiliated. When the lord of the manor sat at high table with his familiars scoffing venison the hunter and his fellows occupied lower seats and ate the umbles in a pie. Source, “Brewer’s Dictionary of Phrase and Fable.”