When thunder comes it rains cats and dogs

from Kendrick Lamar – Sing About Me, I'm Dying of Thirst Lyrics on Rap Genius

Meaning

When gunshots are fired (or the metaphorical thunder), cats and dogs, or his friends, die. It’s a reference to the old saying “It’s raining cats and dogs”, and also demonstrates some wordplay as the TV series ‘ThunderCats’ aired during Kendrick’s youth.

It’s also a metaphor of the saying, “when it rains it pours” (meaning that trouble for dave’s brother just seems to exponentially grow and never get better).

Notice how he distorts “When thunder comes” to sound like the previous “Dun-ta-duns”

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