To be $velt is to emulate the example of The $trom in all ways. This means using hashtags everywhere and just being an intolerable dick, but that is the example the $trom has set and it must be followed.

The $trom is the most $velt person to have ever lived.

It is a capital offence against the $trom to spell $velt without the dollar sign S, and the resulting punishment involves being cursed with back problems for the duration of one's lifetime.