The sign "don't-LIKE" provides a good example of "reversal of
orientation for negation."
What you do is you do the sign "LIKE" and then your "reverse the
orientation" (the direction in which the palm is facing) and you
flick the fingers open.
You can learn
American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars