Dork usually means nerd or geek. However, in my neighborhood, 'Dork' also means elephants penis. There is actually a pretty heated debate about whether or not the word means elephant's penis or whales penis.
Rachel is a really big dork; she spends all of her timestudying and knows a bunch of usless information on obscure topics.
In relation to the Twitch streamer BTMC, The Ed miss, also known as a BTMC miss, or pulling an Ed, is a term for the rhythm game osu! and essentially means to miss where you know you are able to hit a note. It can also be used to describe a play where you choke on the last note of an osu! map or miss a note on the easiest part of an osu! map.
The Ed Miss 1: "Did you see BTMC's play on embraced by the flame?"
2: "Yeah, I see he pulled off another Ed miss and choked the last note."