It's common slang for a huge 18-wheeler
... of 82 wheels,significantly bigger than the 18 wheelers the Americans 
drive... [DOC] [TLE] Guide to Truckers Slang - Codes, dictionary, trucking jobs, trucking ... [PAR] To help you understand the language of the drivers of the 18 wheel big rigs, we 
have assembled some of the most commonly used terms that truck drivers use:.