Taxi cab. (For more words along this line, see English/Cockney Rhyming Slang Dictionary http://www.bio.nrc.ca/cockney/). We have grown to just call them trevors. In Australia they even have number plates that start with a T. Example: He's had too much to drink. Call for a trevor mcnabb.
TREVOR MCNABB
Meaning of TREVOR MCNABB in English
Slang English vocab. Английский сленговый словарь. 2012