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припахивать is to force somebody to "пахать"
Пахать means to plow/plough. On early slang - to do a hard manual work. On current slang means to do any work

блатнячок - diminutive from блятняк which is colloquial form of блатной which is prison slang for "a professional criminal" (means that it is his main occupation in life). High hierarchy in Russian...

умноженные

*"interrupt" is a verb you need "an interruption" here. I'm not sure but I think no "a" is needed before "work"

If only we would base our conclusions on our experience :)
lay day

depends on the context
простой can be a noun or an adjective
as a noun простой means "idle time" (and простойный is an adjective formed from this noun and I think it's spoken quite rarely)
as an...

Yes, I think so too
I think it's "развращение малолетних" - molesting underaged

In his sentence "как раз" means "by the way"
Да я хотел как раз тебя предупредить" - By the way, I wanted to warn you

предзонник can mean two things
1. It is a place around prison
It usually covered with something friable (earth, sand), so any footprint would be easily spotted
It can be quite large
...

It probably comes from the word "house"
It means a "criminals' safe-house"