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1.
How the uneducated say 'could have'
chav: I could of got a E in school fo da english literachar, but i got a ungraded instead.
av kung-fu jesus 24 september 2004
 
2.
A common misconception among idiots who go by their ears rather than their brain. The real way to say it is "Could HAVE", i.e. "I could HAVE gone to the party", rather than "I could OF gone to the party".

It's a common mistake, generally caused because the phrase "Could have" is said so quickly that it is conceived as "Could of", but that's wrong.

"Should of" is the exact same but slightly less common mistake.
Idiot(Through text message): "Man, I could of gone to that party, but instead I stayed home."

Smart person, not an idiot(Through text message): "Are you serious? It's 'Could HAVE', not 'Could of'. Are you stupid?"

Idiot(Through text message): "Well, my name IS idiot for a reason..."
av PetPeevePerson 24 april 2011
 
3.
a misspelling of the contraction could've
After mistakenly thinking that I heard someone use the phrase "could of", I could've wrongly called someone an idiot for using a contraction I am not familiar with, but I did not.
av 2-kuppajava-2 23 oktober 2013