Thank you so much for replying to my thread! It is so gratifying and satisfying to see that other people are happy to engage in analysing the linguistic world that appears all around us!
Your example is perfect! I think that the most relevant and exciting part of your example from an English Language perspective is the slogan! "BCF-ing fun is a great play on "F-ing" fun, i.e. the adjectival use of that swear word. This slogan uses the semantic patterning of a pun in order to portray themselves as relaxed and casual, as well as building rapport with their most-likely-rough-and-tumble audience!
Now it's my turn to try to keep this thread alive!
The other day, my friend's younger brother said "he got big ooft", instead of the more 'traditional' (if you can say 'traditional' regarding a slang term,) "ooft" or "big ooft". Most teenagers know how to implement the interjection "ooft", however my friend's brother is just sliiightly in the out-group, in that he isn't an avid user of social media or internet forums yet, and therefore he didn't quite have a grip on the appropriate application of this slang yet. Therefore, he was unable to attract the covert prestige associated with this teenspeak, and this was interesting in showing his age and also acting to delineate group boundaries (in that he revealed that he was actually part of the out-group). This demonstrates the fragile nature of the implementation of slang, which is super subjective and those in the in-group must understand not only the slang, but appropriate cases to use it in order to build rapport with their listeners and peer group.
I hope the more examples that are posted here, the more that other people will feel comfortable to participate too!