when two people take their right hands (or left if they so wish) and act as if they are giving each other a high five. however, instead of a high five, they wrap their thumbs around each other's hands and wave side to side.
Me: I totally taught Mr. Shepherd the Handhug!
Kaylin: That's great!
KK was amused when she found out how to handhug. Now she, Kaylin, and Madi teach everyone they meet.