It was horrible and all.

[diamondcutter]

It was horrible and all, but it was still the greatest moment in my life because at least I didn’t have to kiss Andrea.

Source: Mr. Hynde Is Out of His Mind, Dan Gutman

I don’t understand what the word “all” means here. Could you tell me?

 

[Barque]

It's an intensifier. It means, roughly, "It was horrible and all that". You can take it as "horrible and having other qualities similar to horrible".

Don't take it too literally. It might mean just "horrible", with the "all" merely adding some intensity.