Wake up the alarm clock is connected to a bomb

from Lupe Fiasco (Ft. Matthew Santos) – American Terrorist Lyrics on Rap Genius

Meaning

Wake up now rather than wait for an “alarm clock” to wake them up, because waiting to be forced to “wake up” will bring some devastating consequences (i.e. death).

Also the cartoon image of a bomb is often an alarm clock strapped to stacks of dynamite:

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