See, she knew about all my lies the whole time
And my credit's so bad I can't get no one to cosign
It’s fair to say Kanye doesn’t have bad money-related credit, so the use of credit/cosign (salesman jargon) is most likely referring to his poorly-ended relationships. Of course if you’re a dick to your exes, word gets around and soon enough everyone knows Ye as “that dickhead who cheated on his girl.” With credit like that, who would wanna cosign (ie: date/marry/hook up with/otherwise associate) Kanye?
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