Would I leave the space, hyphenate it, or combine the two works like its similar, less aggressive counterpart: "dumbass"
The quote from my novel is from dialogue
"It's been six years, you dumb fuck," Gus muttered under his breath.
Which of these would be GRAMMATICALLY correct? If several are correct, which would be the most proper to use for writing planning to be published?
One word; no space, no hyphen: