Love is a wild animal
It breathes you it looks for you
The analogy begins; Till refers to love as a wild animal, a parasite who use you for his own good; to survive. Love survives through you and catch you by surprise when you least expect it, pretty much like an animal.
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The pelvis is the bone between the abdomen and the thighs.
If you can’t digest something, you’ll evacuate it through your back door (in the pelvic area), the “same way” you ate it (well not exactly but you get it). So basically, Kendrick is too good for you, he’s going straight through you; a clever way to say his lines goes way over your head. Also, Elvis was known for his pelvic “movement,” which ties in the previous line.
Hip-Hop has had a long line of rappers that spoke about how they previously sold crack (Notorius B.I.G., Nas, Jay-Z, etc.), especially during Hip-Hop’s “Golden Era” in the 90’s. In the late 90’s, Mos Def criticized the direction where the genre had taken the subject: