And I'm a big dog, he got the lil' boy complex

from Gucci Mane – Truth (Not a Jeezy Diss) Lyrics on Rap Genius

Meaning

“I’m a big dog” refers to himself being physically tall and tough (and perhaps his status too):

Not only does he call Jeezy a midget, he states that Jeezy has a “lil boy complex,” better known as Napoleon Complex. It goes farther, though:According to rumor, Keyshia Cole told Gucci that Jeezy’s man-parts were nothing in comparison to Gucci Mane’s.

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