Phys dick (Physical exercise penis )
This is military slang for when a soldiers penis shrinks a considerable size after under going physical exertion with his platoon ( platoon phys ).
Phys dick can also happen in cold weather, maybe on an exercise in mid January, the penis is confused into thinking it is on company phys.
"Oi lads, I've got proper phys dick"
"That phys was nails, look at my phys dick"
"that bloke looks like he has permanent phys dick"
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