some difficult sentences

[zoobinshid]

Hello everyone,
Would you please tell me the meaning of these sentences?and if they are common or not?

1)sticky point.
2)To laugh in ones face.
3)They are very well spoken.
4)Call it a day.
5)Pitty party.
6)Younger skin.
7)Almost anything can set it off.
8)Shoot the crap.

Thanks in advance,

[Marylin]

1)sticky point. touchy, uncomfortable issue/opic.
2)To laugh in ones face. - to ridicule someone.
3)They are very well spoken.- good with speaking, articulate
4)Call it a day.-that's it, done, finished, that's a wrap.
5)Pitty party. feeling sorry for oneself.
6)Younger skin....? talking about someone younger?
7)Almost anything can set it off. - a volatile situation, a lot of tension.
8)Shoot the crap....b.s. ( bullshit - vulg). or chat.