He uses a lot of contractions, and a lot of words that would end in an 'o' get an 'a' instead.
He says Ya instead of You, or Yer instead of Your, and Ya're instead of You're.
Also he says 'Ain't' a lot.
As for mannerisms, Rip is very energetic with his speech, and a bit loud. Lots of wide hand gestures while talking.