It's like Clash Of The Titans
I released the cracker

from Slaughterhouse (Ft. Eminem & Skylar) – Our House Lyrics on Rap Genius

Meaning

Clash of the Titans is best known for the infamous phrase “RELEASE THE kraken!”. Kraken are mythological sea creatures that are ferocious.

As a spin-off from that line, Em instead says “Release the cracker”, referring to recently signed Shady Records member ‘Yelawolf’, who is white. Also hinting that Yelawolf is ferocious.

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