chew (away) at (something)
To chew on something repeatedly or for a length of time. The baby has been completely miserable lately, except for when he's chewing away at a teething ring.
chew (away) at something
to gnaw or chew something for a period of time. The puppy chewed away at the leather belt all night.
chew someone's ass
reprimand someone severely.chew someone’s ass out
tv. to scold someone severely. (Usually objectionable.) The cop was really mad and chewed Bob’s ass out.