couldn't've

compound contraction of "could not have"

She couldn't've done it, she's way too stupid for a plan that complex! Also see wouldn't've and shouldn't've.

couldn't've by Sunob September 6, 2007

Couldn't've

Conjunction-- could not have

it couldn't've gone any worse.

Couldn't've by No one needs to know that! July 31, 2011

Couldn't'it've 

When you say more of could it not have without saying couldn't've, that is very much slurred as "Cu-dn-d-dv"

Why couldn't'it've been done earlier?

Couldn't'it've by Findloo Chunk August 27, 2020

boner, I've got a ... a dingo couldn't bite through 

Used to describe an erection so hard that, if given the chance, a dingo (Australia's native wild dog) would not be able to damage it.

Given the silliness of the statement, it's usually used to describe a non-sexual situation that a man would nonetheless enjoy very much, such as a sporting event.

When the Cats won the 2007 AFL Grand Final, for the next week I had a boner so hard a dingo couldn't have bitten through it. (boner, I've got a ... a dingo couldn't bite through - gotta use the original here)

boner, I've got a ... a dingo couldn't bite through by Choda Boy 57 May 7, 2008

where't's'h've'could'stuv 

a word used in the shakespere time to figure out where someone or something was

where't's'h've'could'stuv is my pants?

where't's'h've'could'stuv by Xavier and jaden April 19, 2017

Could'ven't

Since:
Could've = "Could have"

and

Haven't = "Have not"

we can infer that:
Could'ven't = "Could not have"

"The detective could'ven't guessed the killer's motive, yet he still found him out somehow."

Could'ven't by HeWhoMakesSoup September 2, 2023