What is a booby trapped sandwich (Scottish slang?)

For me a booby-trapped sandwich sounds like one containing any of those ingredients your teeth don't easily cut through, meaning after you pull back from the first bite the whole slice of whatever threatens to come too, resulting in an extremely inelegant battle to chomp it off so you don't have it draped down your chin while you try to somehow pull it into your mouth like an otter with an eel.

BLTs are the worst for this: all three ingredients are candidates for not being quite bitten through.
 
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Swansea this morning.
 
Found this on-line from his... In the Cold Dark Ground

Logan burst out through the door, into the rain. Reached for his extendable baton... Only his hand closed on thin air. Wonderful. Why did he have to take off his stabproof vest and equipment belt?
Because it was heavy and uncomfortable, and he was only meant to be lurking around the station, making cups of booby-trapped coffee.


and

‘Nah, it’s only Rennie — he’s away to the baker’s for breakfast butties. You want booby-trap or sausage?’
‘Sausage.’ Maybe it’d help settle his stomach? ‘Funeral’s at twelve.’

So I'm none the wiser...​
 
I know most of his stuff, especially the DI McRae books, are set in the city and shire of Aberdeen. It's not a phrase I've come across. I'd hazard a guess at an egg sandwich: one, because police humour can be of that ilk; and two, because if a fried egg still has a runny yolk, it can 'explode' everywhere. Purely a guess, though.
 

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