Lagen means a lot of things but I'll put it in kind of a poem

L - loses your things
A - Annoying

G - Gives you sass all the time

E- Even will punch you for no reason
N - Never gives your stuff back

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.