1) chewing tobacco of the leaf variety. it is actually chewed. kept in side of mouth.
2) chaw varieties include: redman, levi garrett, beech nut, etc.
3) chaw is sometimes added to big league chew to make a delicious combination.
4) if you are talking about fine or long cut tobacco it is called dip not chaw. ex., copenhagen, skoal, grizzly, kodiak, red seal, timberwolf, rooster, etc.

a big wad of tobacco in between your cheek and gum

Chewing tobacco. Copenhagen, Grizzly, skoal, redman.

Hardcore dip. Usually placed in the left corner of the mouth, bottom lip, to stimulate the maximum taste. Mostly, us southerners use this when the wives are bitchin' or some stupid shit to take off the edge. On some occasions, it can be placed on the tip of the penis and used as a lubricant. If the bitch gives you head while chaw is on the dick, it is known as a Georgia Cotton box.

To steal. Pikey word

An exclamation of surprise, delight or salutation. Used with a rising inflection of pitch through which a gradual diphthong "AW-AH" is used. Various permutations of the word are also permitted, eg. "Phwar" or "Hwaw"

Chaw can be anything.