I don't know the exact english word for Lanterfant.
The word Lanterfant and lanterfanten has several meanings.
One is that you're wasting your precious time, by doing nothing in particular and that you're being lazy and that you ought to or do better do some useful work.
The other one is more freeing...when you 'lanterfant' and do nothing in particular, relax and rest, kind of letting go of doing useful meaningful things, like obligations, things that should be done...that makes space for more creative things...and this state of being, opens up possibilities you never thought of.
It has to do with enjoying...and delight.
Anyway, pictures speak more than 1000 words...