noun Informal.
energy; vitality; enthusiasm.
sex appeal.

1935–40, Americanism; imitative of the sound made during exertion, as in lifting a heavy object

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World English Dictionary
oomph (ʊmf)
1.  enthusiasm, vigour, or energy
2.  sex appeal
[C20: perhaps imitative of the bellow of a mating bull]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"sexual attractiveness," 1937, suggestive of the reaction of someone hit hard in the belly. Ann Sheridan (1939) was the original Hollywood oomph girl.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Perhaps you'll remember it when you feel that you need the extra oomph.
It's a good idea to plant them with companion plants as in the photo, to give
  the planting more oomph during the off season.
But so far this season, the winter storms have lacked oomph.
The jets give him powered ascent and the oomph to do loops.
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