How to Sign "Popular"
To sign "popular," hold up your non-dominant index finger pointing toward the ceiling. With your dominant hand in an open "5" handshape (fingers spread), bring it forward to repeatedly strike or tap against your non-dominant index finger. The fingers of your dominant hand should point upward and slightly wrap around the index finger as they hit. Keep your non-dominant hand completely still during the sign. The motion should come entirely from your dominant hand moving inward to represent a crowd flocking to one spot.