GachiBASS refer to BetterTTV Twitch emotes comprising a picture of Gachimuchi muscle man Billy Herrington, which is frequently used as a response to signify intense pleasure or satisfaction in a similar vein to the Kreygasm emote.
According to a comment submitted to r/forsen by Redditor sc2pal on December 3rd, 2015, the gachiGASM meme started after a Billy Herrington wrestling remix was performed on the social music streaming site plug.dj, that was subsequently adopted by Twitch streamer Sebastian”Forsen” Fors.
On October 13th, 2015, the GamesPlace YouTuber channel uploaded footage of Forsen playing Hearthstone titled “Forsen — gachiGASM,” in which viewers spam the word “gachiGASM” in the chat window (shown below, left). On October 7th, 2016, Redditor GreySM submitted a post asking” The best way to produce gachiGASM a global BTTV emote?” To /r/forsen.  On October 20th, YouTuber Camouflaged submitted a few songs in a playlist titled”GachiBASS Radio,” comprising an animated image of the Billy Herrington emote (shown below, right).