"That's what I'm tryna say" is a term used colloquially in the north-west Philly area (mainly at the Hill School--a boarding school in Pottstown, PA). This phrase is used when something good happens, and you would like to signify that you enjoyed it. Think of it as saying, oh wow thats neat! This phrase is usually said quickly and with an accent unlike your own.
M: I got you a cookie from the Grille! They just came out the oven.
I'm not going to say I knew he would say it but that's what I thought he'd said.
Iam "I'm not gonna ny to say that it's correct because it's supposed to be open for interpretation (and I'm not saying it's incorrect either) but the 'face it head on thing'? That's what I thought he'd say."