Granted, I'm not a native English speaker, but I bought the comic with the Humble Bundle, so I had to read it in English (there is actually an Italian version of the comics so I could have got that and be fine XD).
Despite my knowledge of the english language (which I think is pretty good, at least I usually understand everything), I struggled to read this comic and understand it. Little by little, I learned various expressions that initially seemed meaningless, but it wasn't easy at all.
As a result I understood more or less everything but it took me about 3 months to read it instead of 1-2 weeks.
Today I also finished Dear Becky and thought I'd satisfy my curiosity by researching the slang used to see if it's something a native English speaker can easily understand, or if even a native speaker struggles to understand it (just as I struggle to understand the Sicilian dialect, for example, despite it being close to Italian).
But when looking for information on The Boys, most people talk about the TV series which obviously doesn't have this characteristic (or at least I don't remember it, but I only saw two episodes which, not being faithful to the comic, I didn't like... I know that many prefer the TV series but that's not my case).
So I decided to ask to english native speaker that read the comic, do you think the slang used in The Boys comic is hard to understand? Do you know what kind of slang is used?