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can't smoke a rock 

no brain no pain, you can't wear me out
that dude can do pushups all day long but he is fucking stupid, you can't smoke a rock.
a double negative that means you can.
I can't not breath here

Can't Milk a Horse

Used as an exclamation when noting an obvious or moronic error in judgment. Usually suggesting complete unworkability. Also used to designate a situation one tries to take advantage of, where there is no actual advantage to be had.
#1: "I really thought my new pet snake and my hamster would get along. Well, I guess you can't milk a horse."

#2: Jerry - "So I tried to milk this horse and well... you know what they say: 'You can't milk a horse'."

#3: Fred - "I just tried to hit on Nancy at her ex's funeral, but ya can't milk a horse."

#4: "I invested $8,000,000 on the new line of Pogs, but goddam: Ya can't milk a horse!"
Can't Milk a Horse by Skazu March 4, 2010

Can't even kink a hose 

Used to describe ones lack of skill in normally easy tasks. Like kinking a hose.
Friend one: Man, this guy is so stupid he's doesn't know how to make himself lunch.
Friend two: That guy can't even kink a hose.

Can't prove it 

One of Phil's schemes and what he says after it
Phil "borrowed" his mother's car then when she asked for it back phil told her "can't prove it" and proceeded to taught her saying nanana