The expression comes from the JCB company, a UK-based manufacturer of heavy equipment founded by Joseph Cyril Bamford in 1945. It's like saying, "You'd need a bulldozer to dig yourself out of this."
From Ian Rankin's "Resurrection Men," an Inspector Rebus novel, Chapter 16:

"Fuck me?" Claverhouse was shaking his head. "You've got it all wrong, Rebus. It's you the boys in Barlinnie will be telling to bend over. Because if I can tie you to Cafferty and his operation, so help me I'll send you so far down they'll need a JCB to find you."
by RS Gordon October 1, 2007
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when a person is cornered and needs to be metaphorically "dug out" of a situation
You need a JCB to get out of this
by Naman Ali September 2, 2003
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JCB is a abbreviation of the name Jacob it is one of the best nicknames in the game
Ayyyy JCB how was work
by JCB296 April 23, 2021
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A posh school, full of not so posh briefcase wankers that wear the longest fucking shit flickers you’ve ever seen.
Jcb academy building engineers and business leaders of the future
by Donnameat December 15, 2018
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"JCB starter buttons" - A woman's nipples resembling the control to start the engine on a vehicle manufactured by JCB
*Exclamations emitting from a building site probably around the Toombridge/Limavady area of Ireland* 'Look at thon!' ..'Aye JCB starter buttons sir'
by Robotkev August 19, 2013
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used in rural Ireland to describe a woman's nipples if large
she has nipples on her like JCB starter buttons
by legques September 19, 2018
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this is what you type when you have a stroke on your keyboard this is some retarded bullshit
,hvwe.krjhsuc.dy,qideu, vgcajhrbclajhdjcvad,vacsf,jcb,wejfvrhc,wekufvrc,jehf was having a stroke
by biggie cheeeeeese 420 October 18, 2022
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