"L + Ratio" is the Swiss Army Knife of modern internet slang. It is a weapon, a meme, and a badge of belonging all wrapped into one.

It often refers to a reply comment getting more likes than the original comment it is mocking. The "Full" Extension: Stacking the Chain

Dismissing the importance of the original poster's opinion.

Is it a constructive way to communicate? Absolutely not. It shuts down nuance and encourages pile-ons. But as a linguistic phenomenon, it is fascinating. It shows how online culture has shifted from writing paragraphs to debate ideas, to using shorthand code to signal tribal allegiance.