adj. word referring to something that is all that is man. used to describe something manly/huge/awesome. borderline arnold-like. can be added to words to make new, more manly words.
1) John Rambo went on a diesel mcman killing spree in Rambo First Blood: Part 2. he killed around 80 people himself

2) Rambo then ate a diesel mcmanwich, which consisted of 3 pounds of turkey(that he hunted), greasy bacon, nails, a beehive filled with bees, and lava-sauce.

3) Kevin Garnett unleashed a diesel mcman roar when he dunked over lebron james. every baby in the TD banknorth garden was blinded, made deaf, or suffered paralysis from the blast.
by hyaaaaaaaaaaagh!!!! December 10, 2007
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