'To headline' doesn't mean to be in the news. It means to be the main act in a festival. The main act is 'the headline act'.

You spell it H.U.L.L.A.B.A.L.O.O. Hullabaloo. It means a loud noise or commotion.The word hullabaloo can also imply anger and disapproval.

To bounce means to leave.It's a phrase that has come from the USA and it's urban slang, so it's something that young cool kids might say.