The Collaborative International Dictionary of English v.0.48:
Burg \Burg\, n. [AS. burh, burg, cf. LL. burgus. See 1st Borough.] 1. A fortified town. [Obs.] [1913 Webster] 2. A borough. [Eng.] See 1st Borough. [1913 Webster]WordNet (r) 3.0 (2006):
burg n 1: colloquial American term for a town; "I've lived in this burg all my life"