Originated from the YouTuber "LeafyIsHere", this is a pun used in place of "leave a like"

In my opinion, I found this kinda clever the first time I heard this, but now it's appearing on EVERY (And I mean every!) single YouTube video in humanity, which makes it annoying af.

So please, if you're reading this; watch out for these kinds of comments.

(Side note: Another thing that Leafy sorta invented was "HISSSSSSSSSSSSSSS", so you may see that often as well.