It appears IShowSpeed needs to brush up on his K-pop knowledge ... 'cause the popular gamer and YouTuber recently referred to Stray Kids member Bang Chan as "BTS" -- and the whole awkward moment played out in front of thousands of viewers.
18-year-old Speed -- who has tens of millions of followers across all platforms -- was scrolling through videos on his phone as his loyal fanbase tuned in to the stream earlier this week ... when he stumbled upon a clip of the popular group's leader discussing his admiration for the internet superstar.