YES A MASTODON GUITAR SOLO originated in a poorly-written track-by-track review of sludge metal outfit Mastodon's critically lauded 2006 LP, Blood Mountain. The user review, submitted by "Progmaster85" was overwhelmingly negged, both for its poorly constructed grammatical structure, as well as for its over-emphasis and misunderstanding of 'prog.' During the capsule review of track 2, "Crystal Skull," the progmaster birthed the meme that would permeate the dregs of the sputnik review site from that point forward:

Riffs like the ones from 1:13-1:19, 2:25-2:37 are some of the best that Mastodon has ever spawned. Following the second riff, is a guitar solo, YES A MASTODON GUITAR SOLO. Following the speedy solo is a repetition of the intro riff, a very proggy move by Mastodon.

the responses, at first meant at the expense of the progmaster, later became a site-wide mockery of the elitist musical outlook that renders so many of the users socially inept. The review's instant popularity prompted a rough translation of the phrase into other languages, as exhibited in the images below.
http://www.sputnikmusic.com/album.php?reviewid=32618