A skill or "Schkill" originated from the art of pool.
Consists of kissing the knuckle in a dramatic, yet meaningful way when greeting or saying farewell.
However, this gesture is only shared between two people and anyone who tried to copy this is labelled as a leotard
When somebody pots a ball whilst playing pool they shout "nukal schkills" and kiss they're knuckle.
"Laters..*person kisses knuckle as they walk away*"