Double movement. Dominant flat hand (or relaxed 5 hand) taps tip
of thumb of stationary non-dominant "5"-hand.
Senior girls are stuck up. Why?
I don't believe that senior girls are stuck up. This sentence
simply provides a good opportunity to practice various other signs:
The sign SENIOR-(academic) doesn't mean the same as "senior
If you mean "senior citizen" see:
You can learn
American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars