First when i was 11\12 years, i used to have rabogordo as my nick. ( it means gross dick ). Then, forma obviously reasons i was banned from multiple games and had to change it.
I played a tcg calles urban rivals in the browser. And my deck was full of gheist, a faction that uses poison and stuff like that.
So i became gheist. Years later i met german people and they said gheist were pretty similar to a german word which means ghost. "Geist".
So i kept the nick.