You've got it right.
As you've recognized, this is dialect.
Yawl - this is a less common way of spelling the dialectical y'all, which is used as the second person plural.
Hear - this is a shortened form of the expression you hear, which is used in the same dialect as a rhetorical way of asking for confirmation or assent.
In more standard (but still informal) ...
To expand very slightly on Juhasz's correct answer (because I don't have enough rep yet to comment):
"Yawl" - more colloquial way to spell "y'all", meaning "you all"
(which is, in the majority of cases, the second-person plural, although as John Bollinger points out in the comments to Juhasz's answer, it can be second-person ...