And if you're in heaven waiting
You made it there fighting
The tightest kite string
In a bad storm with lightning

from Why? – These Few Presidents Lyrics on Rap Genius

Meaning

It would’ve been as difficult for the addressed person to make it into heaven as it would’ve been to try to fly a kite in a bad storm.

Clearly, the narrator doesn’t think of this individual as having been a particularly good person.

The ‘waiting’ part of the line might imply that the narrator thinks that he has been good enough to deserve heaven, though it might also mean that the addressed is simply waiting for his death.

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