BORED: The American Sign Language (ASL) sign for "bored / boring"
 

Note:  Don't give in to habit. For this sign your finger goes to the outside of your nose.
If you use a double twist it means "boring."

BORED

A variation for how to sign BORING is:

Another option for conveying the concept of being BORED is:

Sample sentence: YOU THINK SCHOOL BORING? (Do you think school is boring?)

Notes: 

A double twist means "boring" in general.  A single twist after pointing to yourself means "I'm bored."  A single twist that starts at the side of the nose and moves out away from the face 12 or so inches with a big movement means "I am bored spitless." 

Also see: FUN

EXCITED