Actually, saying "Idk my bff Jill" is a pretty popular saying amongst the indie crowd at my school, who I relate to most. Also I've gotten people adding "-z0r" to the end of random words that work, and that kind of thing. It's a parody that's sunk into our dialect at school!
I actually think the originally posted adverts are not examples of things that 'try and fail to reach a younger demographic'. It seems to be aimed at the mother more than anything, especially the second one that's talking about a family package.
In both cases it's mummy paying the bill.
And I can see the advert working, as it's probably mildly comical to parents who can relate to their children talking crap all the time.
I can't think of any examples... Apart from when they spell 'school' with a 'k'.
"Bak 2 skool!"
Yeah, so they can unlearn all that crap!