Instant Loss 2koma

Refers to a 2-panel comic or sequence where a character initially expresses overconfidence only to get defeated and/or humiliated. The term originated in the manga fandom, and while it has SFW origins the term is now mainly used within hentai and yiff communities, where it is often used in a pornographic context.

Anonymous R34 Artist: "Wow I should post more instant loss 2koma. The one with Goku and Spongebob really popped off!"

Weed Emo

Weed Emo is a microgenre of Midwest Emo that emerged during the 2010s Emo Revival and popularized by the band Mom Jeans. Weed Emo is defined by its pop songwriting and structures while still retaining the unclean vocals, mathy guitars, and DIY production of Midwest Emo. Weed Emo also deals with lighter themes then most underground emo bands. Instead of writing about loneliness or depression, Weed Emo bands may write about romance and breakups, nostalgia, friendships, getting older, etc. Songs also commonly reference both geek and stoner culture (hence the name). Weed Emo is generally seen as a more mainstream friendly (or poseur depending on who you ask) offshoot of modern emo.

Jack: "Have you heard of the band Oolong?"
Wyatt: "Yeah. Not super into Weed Emo but they're alright. Better than Mom Jeans' newest stuff though."

OSDM

Old School Death Metal. It's a subgenre of Death Metal that incorporates a more retro approach to the genre, being influenced by bands and releases of previous decades (most commonly the 80s and 90s).

Scott: "Have you heard of the band Afterbirth? They're a good OSDM band."
Evan: "I am not listening to a band called something so gross."
Scott: "It's actually really tame..."