It is a truth universally acknowledged that as soon as old people (i.e. the over-20s) start to understand a generation's teen slang, it has already moved on. Wagwan yo'sel, coot!
Edit: Actually some definitions of 'coot' are slightly more insulting than I meant to be. I don't know the street slang word for 'effective transport campaigner who, at a guess, is slightly north of 20', on account of my being and old coot.
coot
noun
1.
an aquatic bird of the rail family, with blackish plumage, lobed feet, and a bill that extends back on to the forehead as a horny shield.
2.
informal
a stupid or eccentric person, typically an old man.
You have to be a bit eccentric to be a transport campaigner, and I note
or not
and in the definition.