1) Joe: Danny's back in town. He lost a bunch of weight, got a nose job, got hair plugs and now wears really flashy clothes but he's still one ugly motherfucker.

Jim: Well, you can't polish a turd.

2) The comb-over hairstyle

Scene from Californication: protagonist suits up for a trial when daughter walks in.
Protagonist: 'How do I look?'
Daughter: 'You know what they say...can't polish a turd.'

"After years, he's just never going to change his selfish ways." "Well, you can't polish a turd!!"

nathan, sell that cavi!you can't polish a turd!

i told that guy trying to pimp a cavi, "you can't polish a turd"

They're trying to portray the poor financial reports as positive, but you can't polish a turd.

you can't polish a turd