Slack means to be loose or limp. It can also refer to a person who is not busy and may be loafing off the job.
To 'cut you some slack' means to ease up on someone, lighten up, bend the rules, give you a break.
It means "Flojo" (to a male person) or "Floja" (to a female person). The person to whom the word applies depends on who's the 'uptight' one in the conversation... and who says it first.
-to release the pressure or tension on something.e.g. You're gonna slack up on that rope, u tied the girl with, right now!
Usually the end roller will have a threaded rod to extend the roller out father.