Green’s Dictionary of Slang

next door; thus texan rude nam, lit. ‘next-door man’, thus neighbour.

1923		(con. late 19C) Northern Whig 12 Sept. 8/6: ‘Kacab-Kalat’ is really ‘back-talk’. One shop-boy would ask another, ‘Where’s the retsam?’ and the reply [...] ‘Texan Road,’ or ‘Enog to rennid.’ This interchange simply meant ‘Where’s the master?’ with the answer ‘Next door’ or ‘Gone to dinner’.
2001		J. Burkardt ‘Back Sl.’ Wordplay 🌐 Texan rude nam: next door man = neighbour.