What does the phrase “Real mature with that one” mean (US English I guess)? Please see ux question #226, second comment, which reads:
Real mature with that one. – Charles Boyung Mar 10 ’11 at 19:20
How can it be rephrased? Is it a crude expression? In what cases can it be used?
For an example of “real mature” by itself, see page 199 of Enlightened, by Allyson Richards, where narrator comments “Real mature, Doc, real mature” after a doctor speaks with his mouth full.