A term used in the UK when someone is desperately trying to convince you that their piece of information or version of events is correct to gain your trust but you know that they're blatantly lying through their teeth. Or someone is trying to sell you the latest designer object (watch, trainers, handbag etc.) and you can clearly see it's a fake. It's as genuine as a 40 pence piece. There is no such thing as a 40 pence piece in UK currency so if someone tried to give you one you'd know it wasn't real money.
A woman looking at handbags on Ebay: "oooo have you seen this lovely designer handbag it's only £10"
Friend: " narr mate it's a fake"
Woman: " it looks genuine to me"
Friend: " genuine! It's about as genuine as a 40 pence piece"

Or

A man after been told someone unreliable information: " rubbish! what a load of old tosh"

The informer: " narr mate it's absolutely genuine"
Man: "yeah about as genuine as a 40 pencepiece"
by hteb78 January 24, 2024
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Pencing Them Off

The act of surrounding someone with plexiglass to protect others from that person’s infectious diseases; specifically one who insists on not following recommended quarantine guidelines after significant COVID-19 exposure.
Did you hear Steve and Sara came to Michelle’s baby shower? Yeah, they endEd up Pencing Them Off because his brother’s kegger last weekend was deemed a superspreader event.
by hollimer October 26, 2020
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2 pence short of a cent

Mate you’re 2 pence short of a cent
by Damonnn84 February 12, 2023
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Hang Mike Pence

Something the very peaceful MAGA people like to say since January 6th, 2021.
"Hang Mike Pence, Hang Mike Pence, Hang Mike Pence!"
by ShigShug August 12, 2023
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Pencing

The act of placing Trump / Pence Campaign signs end to end forming a boarder around your yard forming something similar to a fence.
Omg look at the Pencing those redneck fucks put up in their yard
by LongDongLarry September 25, 2020
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Pencing

The act of fencing something off with plexiglass. Specifically to prevent the spread of disease. Named after Mike Pence, so likely to have COVID after spending time with trump that they had to erect a plexiglass shield during the debates to prevent him from getting other people sick. Pence is the head of trump's COVID task force.
"Oh, shit, she got the COVID? Dayum, we better start pencing her off from everybody else!"
"If they're not pencing that salad bar off then we better not eat at it!"
by mycooper October 26, 2020
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Pencing

When you walk out of a big event to make a statement.
Mike was upset at being dissed, so he did some Pencing.
by sesmith70 October 10, 2017
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