Longman Dictionary of Contemporary English
n. (context UK Australian New Zealand English) A long time (especially a longer time than expected); ages
Usage examples of "yonks".
S-forms wi Hibs yonks ago, but naebody hud offered Billy any contract.
No too soft, no too hard, like Terry once said ootside the chippy yonks ago.
Sad, but it wis yonks ago now, n eh wants tae try n screw the nut a bit.
Some nights he used to sit with us, when we had a fire, and blather on about yonks ago.