Dimber is defined as:
Pretty. A dimber cove; a pretty fellow. Dimber mort; a pretty wench. CANT.
-1811 Dictionary of the Vulgar Tongue by Francis Grose
“Oh you’re a pretty fellow are you?”
Hey, it is dimer mort to you! Why can’t a mutant ant be pretty?
“I didn’t say you weren’t. But I really don’t think those fake eyelashes are necessary.”
They are hard to apply.
“Those would be my special golden eyelashes I was saving for a photo shoot. You are more of a dimber damber aren’t you?”
“The completest cheat.”