for cryin' out loud!

[Alicelily]

Ross: Let me ask you something,at your school was there a like uh a place on campus where students went to uh, fool around.

Rachel: Yeah, there was. It was- there the corner of the library where -where all these dusty books that nobody ever read-Yes,there was.

Ross: Great! Beacause people kept showing up, I think it's like uh- a thing!

Joey: Now hold on a second,fifth floor against that back wall?

Ross: Oh for cryin' out loud!( He storms out.)

=>What does "I think it's like uh-a thing!" mean?

=>also,what does " for cryin' out loud!" mean? ^^;

[Mister Micawber]

.
'a thing' = a popular activity.
'for cryin' out loud' is an idiomatic exclamation of disgust or dismay.
.