The term originated when men, in the 19th century, decided it was more fun to hangout with friends at the pub after work than go home and massage their respective wive's feet.
Nice try, but no, that's not what it means. Any woman could tell you what that word really means.
Extensive scientific research in the field of behavioral sciences has shown that the word "manslaughter" is the male species' clever way of disguising the phrase "man's laughter."
"Man's laughter" is what some wives receive after they sweetly and ever-so-politely ask their spouses to pick up after themselves so they can manage a 5-minute break after slaving in the kitchen to cook their man's hot meal.
(Not my spouse, of course, who's [almost] perfect in every way. :-)
LOL - I got nuttin'! You win!