the straight number system comes from the original word str8. that is the average. if something is really straight u can put str9 or if it like even str8r then u can put str(fitylevin) thats the highest cuz we all know u cant beat fitylevin.
When someone uses an absolutist tone where it doesn't belong, like when talking about movies. A reference to the line from Revenge of the Sith; "Only a Sith deals in absolutes."
"Did you see that Last Jedi review that just went up?"
"Yeah, but I'm not watching it. That reviewer can be straight up Sith sometimes."