When someone does or says something particularly stupid, one pretends to check for a fever as a gesture of false sympathy (or "cupping" their forehead). One then lifts their hand off their forehead and comes back down to smack them in the forehead. Cup 'n Smack is a form of tough love.
When a man has his gentleman tackle cupped and his rod tugged by another person, whether of the same sex or the opposite. Can be performed as a solo act, however is frowned upon.
Mathew: "Damien i would greatly appreciate a cup n tug!"
Damien: "Well present the goods, i cant let you do it yourself as that is frowned upon"