Insults in Sign Language?

The sign for "insult" uses an index finger. Move the finger forward and up with a twisting motion.

How do you do the F word in Sign Language?

The letter F is signed by holding up your dominant hand, palm facing out, with your index finger and thumb touching, while your 3 other fingers are held up and spread apart. Make sure to form a circle with your thumb and index finger touching.

Is there any swear words in Sign Language?

The thumb/index finger side of a b-handshape struck against the chin means "bitch" (contact point is the side of the index finger). "Bastard" can be produced by doing the same sign but locating it on the forehead. The sign for "bitch" is often confused for the English sign "be" or the sign "breakfast".