Re:Don't Start Big, Start a Little Snowball
by elgenie on Tuesday September 13, 2016 @12:42AM
(#12485675)
The cited first sage of "goat"-as-common-idiom-for-failure in that article is from 1912.
The acronym dates back to maybe 1992 or thereabouts: http://www.grammarphobia.com/blog/2016/07/goat.html
GOAT, the positive acronym, isn't even used in today's sportswriting about basketball (at least without an unpacking explanation). It's more of a slang / online forum term.
Odd that the first example appears to be from a basketball write-up, which is exactly where I very frequently hear the term goat/GOAT used in the sense I described.