Can't polish a turd 

Despite your best efforts, there are some things you just can't fix/improve.

To point out futile attempts to conceal/change the baisc nature of something.

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

Can't polish a turd by henryj May 12, 2006

can't tell me nothin' 

A phrase that instantly refutes hating, unwarranted criticism, and other nonsense when said criticism is levied directly at its object, as opposed to through an intermediary. Made popular by the Kanye West song of the same name.

Playa': {Walks into club, solo, sporting black fedora and one-button blazer.}

Hater #1: Ayo, nigga, Usher want his hat back!

Hater #2: Yo, ur homiez shinin' up the Benz, gee?

Playa': Man, y'all can't tell me nothin'!!

can't tell me nothin' by M.C. Escher January 15, 2008

can't catch a break 

nothing ever works out

Katia's phone always breaks, she always gets her stuff stolen and her bus lady hates her!
Katia can't catch a break!

can't catch a break by boomswag420420420 April 13, 2014

can't deal 

When someone says 'can't deal' it means that they can't cope anymore under their circumstances.

'Can't deal'
'Can't cope'
'Can't carry on'

Etc.

can't deal by alice wendy eeyore October 31, 2013

Can't do it!

An exclamation made when you simply can't do anything anymore. Basically giving up.

Geo: *Tries to jump rope but fails* I can't do it!
Liza: Come on try again!
Geo: I simply can't do it!

Can't do it! by GearSecondMaster June 18, 2011

Can't Get Right 

adjective describing an individual who is constantly fucking up, causing fuck ups, or is always in the middle of a fucked up situation

noun-person who is constantly looking like Helen Keller dressed them

Man1: Dude there goes Cory again! Look at him.

Man2: Man, Cory is one can't get right mutha fucker.

Can't Get Right by mjp917s November 20, 2010

can't hack it 

1) Basically like if you can't handle someone or something.
2) or if you don't understand something

1: "mate did you see the snow outside?!"
"Yeah it's so cold, can't hack it mate!"

2:"Have you started Miss C's work yet?"
"Nah, Its so hard I can't hack it!"

can't hack it by puresource May 8, 2016