Fezzik was employed by Vizzini. He doesn't have a problem with subverting the law, but doesn't like to fight dirty. He is friends with Inigo; the two like to play rhyming games with one another from time-to-time at the ire of their employer. Fezzik is very tall and big so at a very young age, his parents made him fight competitively. He is from Greenland where he was unemployed.
INIGO: Vizzini...he can..fuss.
FEZZIK: Fuss, fuss...He sure likes to scream...at us.
INIGO: He probably means no...harm.
FEZZIK: He's very very short on Uh...charm.
INIGO: You have a great gift for rhyme.
FEZZIK: Yes yes...some of the time.
VIZZIN: Enough of that!
INIGO: Fezzik...are there rocks ahead?
FEZZIK: If there are...we'll be dead.
VIZZINI: No more rhymes now, I mean it!
FEZZIK: Anybody want a peanut?