Miriam none of them are derived from names. Not that I know of.

You are right with the unf meaning.

The meanings of the following words/phrases are things I've learned over the last 15 or so years from online friends that were in 'fandoms'.

Flail- in the physical sense when fangirls/fanboys are happy they flap their hands and waves their arms like they are a bird trying to fly. (sounds silly I know).

unf- your definition was right.

'I can't even'- when you're so at a loss for words.

'what is air'- when you feel breathless during fangirling and are so in awe

ship- when you enjoy the idea of two people together that aren't actually together in real life

otp- stands for 'One True Pairing'. kind of relating back to ship. It's your favorite ship of two people together.

feels- are all the feelings that you feel when you're fangirling.

fangirling- this can be a range of reactions/emotions.

squee- the sound girls make sometimes when they're fangirling. It's like a high pitched fire engine racing down the street kind of sound.

“Only the most pop culturally isolated…”? That seems like a bit of an exaggeration, or maybe I’m guilty as charged. I’ve never heard or used the word. As far as listening to Eminem songs, that driving off the bridge idea is beginning to seem like an appealing option. 

Joe:

I agree with Alice. Slang words are generational. They come and go pretty rapidly. As someone who grew up in the 90s, I don’t use contemporary slang. I’m familiar with it, but it’s not something in my native lexicon. It would sound weird if I used words like “stan”. These words don’t have the time to make it into the formal/written language. They don’t stand a chance to kill the language.

Additionally, text-speak expressions like “lawl” and “eksdee” are usually said tongue in cheek. Youth culture nowadays is filled with irony.

Ok, so I learnt that nouns, adjectives and verbs that are named after people are called eponyms. There are 5 different kind of eponyms: <a href="https://www.dailywritingtips.com/5-types-of-eponyms/" rel="noopener noreferrer" target="_blank">https://www.dailywritingtips.com/5-types-of-eponyms/</a>;

@Alice

Are any of the words you cited verbs that were derived from names? Do you mind explaining their meaning because I don't know most of them. Wiktionary explains "unf" as "Inarticulate grunt of desire issued upon sighting someone sexually attractive, or made in response to a spasm of pleasure during sexual intercourse." (<a href="https://en.wiktionary.org/wiki/unf" rel="noopener noreferrer" target="_blank">https://en.wiktionary.org/wiki/unf</a>;). I know "to flail" only as beating with a flail. The top definition of "to flail" in the Urban Dictionary is "To be extremely high on meth. To the point where the person is trying to take apart and put together working electronics/gadgets while having 6 conversations with different people at once and not accomplishing ANYTHING, generally resulting in at least 1 person getting very angry." (<a href="https://www.urbandictionary.com/define.php?term=flail" rel="noopener noreferrer" target="_blank">https://www.urbandictionary.com/define.php?term=flail</a>;). I'm not sure that this is what you meant here.