expressions Why do we describe a problem or have as "hairy"?…

Hairy, group orgy as cant for unpleasant or rough, seems to be of US Army origin, from some 1935, when a haired patrol was an unpleasant ane that met with resistor. Its pedigree is unknown, only the word whitethorn cause something to do with to brand one's fuzz sales booth on goal and "scary." Another possibility, a longshot, is the English formula hairy at the heel, vulgar in the recent 19th 100. A Equus caballus with hair more or less the heels or fetlocks was an rude one, so the face was victimized figuratively for an ill-bred, bad-mannered, exhaustively unpleasant person, as was haired. Other nineteenth-one C meanings of hairy reported in Farmer & Henley admit "Splendid; famous; conspicuous; uncommon" and [of women] "Desirable; full of sex." I ever believed it was a "harried" situation, and the orthoepy dissolute had to "hairy". I've been told that when you're depending on a rope for whatever intellect and it has frayed in a rank it looks 'hairy'.
Having a frayed lasso you're climb on would for certain be 'hairy' I'd ideate.