It's definitely "have spoken" and not "have spoke" (I have spoken, I spoke), but I think what Lagunavii is getting at is that people don't always talk correctly, and when it's done enough, you know what someone is saying even though you know it's said in the wrong way. The example of "I could care less" is one of the biggest examples, where (particularly American) people say it so often, even though it pretty much means the exact opposite of what they intend by saying it. Everyone knows what they mean though.