I understand that the 737's were called FLUFF's which stands for Funny Little Ugly Fat F***ers and that the A340's have been referred to by the 747 pilots as "Babe" because it doesn't know whether it is a pig or a dog.
The 737's are commonly referred to as maggots because according to some thats what they look like. Others referred to it as the "ute" because it has hub-caps and is a great work-horse.
The BAe748 was referred to as the 30,000lb dog whistle (because of the high pitched whine of the Turboprops - F27 was similar).
The BAe 146 was always referred to as the slug - that says it all.
The original metroliner was called the terror-tunnel or "the widow-maker".Never flew one so dont ask me why.
F111 is called the pig. The Caribou is the green gravel truck. C130 Herc is called commonly the trash-hauler.
The F28 was called affectionately the "pocket-rocket".
The JT8 engines on the 727 were called fuel converters (because they converted fuel into noise,smoke and residual thrust!). A real plane with real engines!!!