Offend / Offense / Offensive / Insult / Affront
Variation 1
Same motion as the American Sign Language (ASL) gesture for "offend" shown below, but have a palm, facing down, above the index finger such that it sticks out of at the end of the sign.

Variation 2
Hold one arm at a 45-degree angle, with the elbow being lower than the hand. The palm of this hand should be facing down. The other hand forms the "O" hand sign and slides it down the outside of the arm.