A large American car. Usually has a large V8, handles like an aircraft carrier and gets extremely bad fuel consumption.
Basically any car that has been produced out of America from the 60's on, but some before then.
Newer Oldsmobiles (Especially 1977 Oldsmobile Cutlass)
Plymoths (Excluding Prowler)
Uh-Oh, A corner. Might as well get out and walk.
Some however think that the size of the engine of an yanktank should be given in cubic inches, and if it isn't it's not a real yanktank.
Mike: What does he drive then?
Fred: He's got a '64 Impala.
Mike: Oh, yeah, that's an yanktank for sure.