1862  (1935)  The title of "Scokum tum-tum Siwash," or "Strong-hearted Savage," which he was much given to insist upon as being one of his special designations, often seemed to me not inaptly to describe him.
1884  . . . they had inquired . . . if I had a skookum tumtum (a stout heart). . . .
1958  Heehee tumtum was a merry heart, and a sad one, sick tumtum. The word came not from tummy, but from the beat, or thump of the heart, and conveyed mental attitudes. Skookum tumtum naturally meant brave
2 See quote.
1915  The cultus Indian was at Lillooet when this skookum tumtum (good thought) occurred to him.