I cannot find yada-yada documented in perldoc version 5.16.0 perlop.
perlop
I also do not see the rejection notice perldoc perl5160delta. Is he still there?
perldoc perl5160delta
Looks like he's still there. Find "yada" in perldoc perlsyn (5.16.0):
Note. Some people colloquially refer to this punctuation bit as "yada-yada" or "triple-dot", but its true name is actually an ellipsis.