It's huge if you refuse to blow your fuses

from Lupe Fiasco (Ft. Pooh Bear) – Heart Donor Lyrics on Rap Genius

Meaning

Keep your cool. When you “blow your fuse,” you figuratively explode with emotion, making poor decisions. It’s great if you are able to control your emotions and not blow your fuse—because if you can, you’ll be able to blow up and succeed like Lupe did.

Ironically, “blow your fuse” means to explode. However, if you literally blow your fuse, you won’t explode, because you need a lit fuse to create an explosion. So refusing to blow your fuse out will allow you to explode. Such is Lupe’s genius.

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