Hebrewספיחס [Sapikhes]A greeting to someone who got a new haircut, usually followed by a slap on the back of the head.

When you see someone who got a new haircut and you want to acknowledge it, you say Sapihes (the kh is pronounced like a Spanish J). This is usually followed by the person who got a haircut saying "thanks!". There's also a children's version of it when you see someone who got a haircut, you have to shout "no rules or mitzvahs!" and then everyone gets to give him a slap on the back of the head for each birthday he had. The person who got the haircut can shout "with rules or mitzvahs!" to counter that. Damn, kids are dumb.