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A mistake or a failure. The word can usually morph into the meaning of your choice with negative connotations. Yonk does not describe people but is a description.
Bro, I just yonked my APUSH test.

I tried to talk to that guy over there.
Yeah I saw, that was a yonk.

Tommorow is going to be such a yonk!
by broski62726618 November 30, 2018
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3
British Slang, Measurement of Time;

1) The unit of 'Yonk' is known to be exactly 3 Months and 13 Days.

--> Used to describe a long period since you last saw someone or something. Usually termed 'Yonks' rather than a 'Yonk'.
1)
BOB: "Gee Willy, I haven't seen you for Yonks!"
WILLY: "Yeah, must be about 3 Yonks actually."
by Stuart Fletcher November 10, 2004
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4
An extrememly long time. (noun)
Dude, I haven't spoken to you in yonks!
by HLNT October 19, 2004
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5
a very long time, usually a number of years
"I've been mad for fucking years, absolutely years, been over the edge for yonks, been working me buns off for bands..."
-Pink Floyd, Dark Side of the Moon (Speak to Me)
by Chris August 25, 2005
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