Plus if they get caught how you gonna keep your heart fatigue

from Lupe Fiasco – Jedi Mind Tricks Lyrics on Rap Genius

Meaning

If you get caught, how are you going to feed your addiction to greed? Opens into a metaphor below on the comparison of Cake/Dough/Bread (money) to heart disease

Also, if you use the theme of stealth from the last line to read this one, “how you gonna keep your heart fatigued” means “how will you keep your emotions hidden”. Combat fatigues are camouflaged uniforms for soldiers:

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