They then take all the discarded "r's" and insert them in spurious places. "pahk ya cah on Warshington Street."
Guys has largely been re-defined as a sex-neutral term in the northeast, going back several decades. It would never occur to me that addressing a group, "hey, guys!" would be seen as any different from a southerner saying " hey, y'all pay 'tention here!"
I grew up just south of Boston and do not have the accent somehow. Growing up I constantly got, mostly from other kids but sometimes grown-ups, too, the query, "How come you talk funny?"