Easton's 1897 Bible Dictionary:

Og
   gigantic, the king of Bashan, who was defeated by Moses in a
   pitched battle at Edrei, and was slain along with his sons
   (Deut. 1:4), and whose kingdom was given to the tribes of Reuben
   and Gad and half the tribe of Manasseh (Num. 21:32-35; Deut.
   3:1-13). His bedstead (or rather sarcophagus) was of iron (or
   ironstone), 9 cubits in length and 4 cubits in breadth. His
   overthrow was afterwards celebrated in song (Ps. 135:11;
   136:20). (See SIHON.)


Hitchcock's Bible Names Dictionary (late 1800's):

Og, a cake; bread baked in ashes