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1.
The act of havign sex with every member in your family, within a 24 hour timeframe. Is punishable by face transplant. However, if it is proven that all were not within the 24 hours, it is not constituted as Ribery. Lord Geo III was famously hung for Ribery, until it transpired that he actually had sex with his father AFTER 24 hours had passed, since he had sex with his brother.
Alan: Dude you're addicted to Ribery

Vinny: I know, don't tell anyone plz
by Alan Small July 11, 2006
 
2.
The act of having sex with every member of one family within a period of twenty-four hours.
Kerv: I had sex with the mother, the father, the son, the daughter, the dog...
Microwave-Face: That's enough Kerv, i swear you are fucking addicted to ribery!
by The Strokes Man July 10, 2006