How the christ does the Y Combinator work?

Fuck, I've been rereading http://mvanier.livejournal.com/2897.html for the past several hours and it might as well be written in Esperanto. Am I just not cut out for EXPERT PROGRAMMING‽

>>23
Practically though, this is only syntactic sugar. Any function that can be written your way can also be written my way. The only difference that in each call to my function I have to specify it as first argument. Y is a wrapper that does it for me by putting that function I otherwise would have to specify myself into environment of function it returns. If you're >>20 I want you to apologize for the nonsense you wrote without thinking.