Likely Lemon Law.

Lemon laws are laws that provide a remedy for purchasers of cars and other consumer goods in order to compensate for products that repeatedly fail to meet standards of quality and performance. Although many types of products can be defective, the term "lemon" is mostly used to describe defective motor vehicles, such as cars, trucks, and motorcycles.

https://en.m.wikipedia.org/wiki/Lemon_law

After some search I've found that a 'lemon' is a slang term for a defective product.

https://www.wordsense.eu/lemoning/ It's number 5 here ^

It's more of a legal term of art than a slang term at this point. It's written into the statutes in some states, e.g. in Florida: http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Displ...

"All I want is a refund!"

https://www.youtube.com/watch?v=fQaavQNGsMY