The Ying Yang Twins are back! Yes, that hip-hop duo who topped the US charts in 2003 and 2005 with hits like "Salt Shaker" and "Wait (The Whisper Song)", and who collaborated with Ms Britney Spears on her song "I Got That (Boom Boom)"...Yes, rappers Kaine and D-Roc are back! The 'Twins' saw how…