Definition from Wiktionary, the free dictionary
yonks pl (plural only)
- (Britain, Australia, New Zealand) A long time (especially a longer time than expected); ages
- Haven’t seen him in yonks!
- I’ve been a teacher for yonks - I should really try another career.
- This egg is taking yonks to boil.
Common in many English-speaking countries but not those of North America, where it is generally unknown.