What is シャケトラ?? (Girlish Number episode 2)

It seems to refer to Sciacchetrà, a sweet wine. Does that make sense in the context of the episode? I haven't seen the show.

That is this scene, is not it?



That said, omitting "よっしゃきたコレ！". (Yossha kita kore!)
It's only Chitose to say such a thing. Chitose's wording is abnormal, so even if you talk to a common Japanese person in the same way it will not be understood :(
In English, it means the following.
awesome sauce!
hot dog!
did it!
woo-hoo!
great!
brilliant!
amazing!
awwwww yeah!
who's the man?!