An Internet term and the biggest ever flashmob in the history of russian Internet community. Bastardization of russian word 'Privet' which is translated as 'Hi'.
Very similar to 'ORLY' stuff... Nearly never used without 'Medved' character (The Bear) and raised hands.
'Preved' symbol - Y
In other words - this is what medved said, when he met a couple having sex in a wood.