Smoothskin

Smoothskin is a derogatory term that ghouls use to describe someone who is human, referring to the less ravaged outward appearance of humans compared to their own.

Appearances
Many ghouls in Fallout 2, Fallout 3 and Fallout Tactics call the Player Character a smoothskin. Most likely the first you encounter in Fallout 3 is Gob in Megaton.