Significat

1. to plug in; to drive something in by its point, as with a nail or a stake
2. to file, record, track (e.g. by police)
3. to not care
4. (colloquial) to do
5. (colloquial) (colloquial, reflexive, followed with "de", se ficher de/se fiche de (quelqu'un)) to make fun of someone