Etymology
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straw man (n.)

1590s, "doll or scarecrow made of bound straw," from straw (n.) + man (n.). Figuratively, in debates, by 1896, from man of straw "an easily refuted imaginary opponent in an argument," which is recorded from 1620s.

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point man (n.)

"one who leads a military patrol in formation in a jungle, etc.," 1944, said to be from point (n.) in military sense of "small leading party of an advance guard" (1580s) + man (n.). A more literal sense also is possible. Point (n.) in U.S. also meant "position at the front of a herd of cattle," and pointman in this sense is attested by 1903.

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merry man (n.)

"companion in arms, follower of a knight, outlaw, etc.," late 14c., from merry (adj.) + man (n.). Related: Merry men.

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wild man (n.)
c. 1200, "man lacking in self-restraint," from wild (adj.) + man (n.). From mid-13c. as "primitive, savage." Late 14c. as a surname.
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ditty bag (n.)

"small bag used by sailors for needles, thread, scissors, thimble, etc.," 1828, nautical slang, of uncertain origin, perhaps from the alleged British naval phrase commodity bag. Hence also ditty-box (1841).

Every true man-of-war's man knows how to cut out clothing with as much ease, and producing as correct a fit, as the best tailor. This is a necessity on board ship, for the ready-made clothing procured of the purser is never known to fit, being generally manufactured several sizes larger than necessary, in order that it may be re-cut and made in good style. [Charles Nordhoff, "The Young Man-of-War's Man," 1866]
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Machu Picchu 

15c.  Inca citadel high in the Andes Mountains of Peru, from Quechua (Inca) machu "old man" + pikchu "peak."

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Robinson Crusoe 
"man without companionship," 1768, from the eponymous hero of Daniel Defoe's fictional shipwreck narrative (1719).
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white noise (n.)
"sound made up of a random mixture of frequencies and intensities," by 1970, from white (adj.) + noise (n.).
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mano a mano 

in reference to combat or competition, "hand to hand," 1970s, Spanish, from mano "hand," from Latin manus "hand" (from PIE root *man- (2) "hand").

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sugar daddy (n.)
also sugar-daddy, "elderly man who lavishes gifts on a young woman" [OED], 1926, from sugar + daddy.
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