When I got my Mazda 323 in 1991, I called it "the 323 establishment."
Yes, that's a weird nickname, but it was a play on Naughty by Nature's "O.P.P.," particularly the line about "...this O.P.P. establishment."
Ten years later, I have a Mazda Protege sedan. I haven't nicknamed it yet because it's a rather dignified color of champagne.