tanker
dated slang A drunkard or heavy drinker. Primarily heard in US, Canada. I have to call it quits after two or three beers. I can't keep up with tankers like them.
tanker wanker
slang A humorous pejorative for a pilot or crewmember of an aerial refueling craft of the Royal Air Force. Primarily heard in UK. A: "My dad was in the RAF for seven years." B: "Yeah, but he never flew in any battles. He was just a tanker wanker!"