That's a Bathtub Nash--the '49-'51 Mercurys are sometimes called Bathtub Mercs, and I've heard the '48-'50 "Pregnant Elephant" Packard called the Bathtub Packard. And then there were '48-'54 Bathtub Hudsons...
Speaking of pregnant--there was the "Pregnant Buick" of 1929--just a little bulge below the beltline in an attempt to be distinctive, but there were so many jokes about it that the styling was dropped...
I've heard DeSoto grilles referred to as "buck tooth"... stories vary, but postwar Buicks gave rise to what was called the "Dollar Grin" in England....
'49-'51 Ford are called "Shoebox Fords" by some collectors these days.
There were "Jellybean Fords" in the '80s, starting with the Taurus I believe.