Why we argue anyway? Oh, I forgot, it's summertime

from Kanye West (Ft. Rick Ross) – Devil in a New Dress Lyrics on Rap Genius

Meaning

Summer heat makes you sweat when you fuck, break dishes when you fight and makes your eyes wander more due to attractive young ladies showing more flesh. It’s also when many artists go on tour

As an alternative interpretation it could be that Kanye and his girl find any reason to fight

This can also be referring to the common idea amongst young people in urban America; that summertime is designated for being single and able to date whomever you please, while the fall and winter are looked at as “cuffing season” (being in a relationship). Kanye sarcastically says the line and can possibly be thinking to himself that his girlfriend is starting arguments that will lead to a breakup, so she can be apart of the single crowd that is glorified in young urban America

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