Having worked mainly away or overseas, to do with heavy engineering. Bloke banter over suspecting some fella may have a big one
A few of my favourites
Like a babys arm
Like a blind cobblers thumb
But my favourite. "Must have two hands full, with enough room for a wild duck to land on "
Anyone add to these
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Hung like a horse
Donkey cock
Chocking hazard
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It’s filled a pram…
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“He tapes it to his leg”
“He stands like a tripod”
“He can open the door without using his hands”
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Heat seeking moisture missile
Throbbing python of love
2 metre beater
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One eyed trouser snake
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Way back in uni days a lady suggested “spitting fuck stick” to me, not relevant to big willies as the thread requested but in stuck in my mind.
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One guy I knew years ago got called “Rogue.” Short for, “hung like a rogue elephant.”
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Hung like a Draymans horse.
Jake the peg.
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Mrs W here …….
Like a babies arm holding an orange ….. xx
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One Eyed Willie from The Goonies always gives me a giggle.
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I’ve heard a few 
Third leg
Meat hammer
Python
Trouser snake
Gearstick
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Biggus… Dickus
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I’ve always been tickled by the origins of names use in aircrafts.
Cock pit
Joy stick
If men started to use similar terminology for items in a vehicle today , they’d get lambasted for being sexist or misogynistic.
Funny how rude terms of years gone bye become mainstream in modern society.
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I almost forgot.
Purple headed womb ferret
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Love truncheon.
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Funny how you keep thinking about things in the back of your mind, and then something surprisingly pops up from nowhere.
Here’s one that just happened to me!
Donkey Knob.
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Meat sword
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Schlong
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Also pork sword