Wash me, watch me
The second hand couldn’t even clock me

from Das Racist – Rainbow in the Dark Lyrics on Rap Genius

Literally he’s saying that he’s so fast, that the second hand on a clock isn’t fast enough to keep up with him.

But also there are additional puns at work here. Unrelated to time, “the second hand” could refer to “the other hand,” as in the common phrase “one hand washes the other.” To “clock” someone is to hit them with your hand. So the second line could mean, “The other hand couldn’t even hit me,” and even though that doesn’t make much sense contextually, it’s worth noting.

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