“H-Town” ia hip-hop nickname for the city of Houston. Several cities were called “h-town” in CB language that existed in the 1970s. However, hip-hop probably didn’t borrow from CB slang when the “H-Town” term was popularized, about 1990.
 
   
Urban Dictionary
h-town
H-Town (AKA Hustle Town, AKA Houston) is where all the best Rappers come from.
Somebody:Hey yo Flip whatchu reppin?
Lil Flip:H-Town nigga.
by Devilish Eminem Jun 18, 2003
 
Google Groups: alt.rap-gdead
From:  ucc34
Date:  Wed, Feb 20 1991 4:50 pm

THIS IS DEE FROM H TOWN “HOUSTON “