A knot tied in a [[cherry]] stem by the [[tongue]].

It is intended to be a display of their lingual dexterity, and suggests that they are very good at [[kiss]]ing... and perhaps [[oral|other things]] as well. 

Often done with the stem sitting on the [[tongue out]]. It also may be accompanied by a [[seductive smile]] or [[naughty face|naughty expression]].
cherry stem knot