Meaning of some sentences

[zoobinshid]

Hello everyone,
Would you please tell me the meaning of these sentences?Are they common?Do they have any synonym?

1)Party Pooper.
2)To flush something out.
3)This cutie really knows how to get jiggy with it.
4)If you do this you won`t go far wrong.
5)Goober that one up.
6)Dead ringer.
7)Go on get it off your chest.
8)He's as straight as a gun barrel.

Thanks in advance,

[Tdol]

1- someone who ruins other people's fun
2 to expose something
3 she's attractive and sexy
4 this is a good path to follow
5 no idea
6 lookalike
7 make a worry or problem public
8 honest