However, I think that "wrap em like an egg roll" likely refers to either wrapping a body before dumping it into a body of water OR killing someone, and thus having them wrapped in a black body bag.

About the fully fully auto, it does in fact refer to a weapon that continue to eject rounds until the ammunition is exhausted. The "Shawty bout that good plate", not only in keeping with well-established culinary metaphor (wordplay!) could also refer to the plate of a firearm which is (I believe) part of the mechanism that allows the cartridge to drop out (making it automatic). Don't quote me on that last part though. Or do, whatever.

Egg roll/gyro is money rolls talk.

It's not "beat up out the taco" but "meat up out the taco," which is a fairly common euphemism for beating someone until their brain spills out of their skull.

Feed 'em to the octos / sleepin with the sting rays is sleep with the fishes stuff.

"Shawty like that good plate" = women enjoy the diverse culinary platter I offer - I beat the shit out of people and have money.

I agree with Riggs that the extra lamb in line 1 is an extension of more common "meat" euphemisms, though it also has secondary link to lambskin and lanolin, the preferred condom material and lubricative product of sketchballs everywhere.

"wrapping it up like an eggroll" is about making sure to use a prophylactic, furthering the lamb reference (which after all, was presumably inside the pita?).

Ted's reading of "meat up out the taco" is probably better than "beat up out the taco," but really, both are equally suggestive of pounding the pussy.

I am forced to conclude from the octo line that Gucci Mane has eight dicks. Alternatively, he could be referring to the dicks of an 8-member posse? A more realistic reading would be a reference to Brian Fantana's named phallic from the movie Anchorman: it's called the octogon. It also enmeshes his ongoing food metaphor with a more common metaphor of lust as an appetite.

I'm at a loss on "fully fully auto." Does he fuck on autopilot? Does he automatically resort to fucking? I lean towards the former.

I'm with Riggs on the "good plate:" the girl obviously loves to eat cock.

I'm partial to your reading on the stingray line. Other possibilities courtesy of urbandictionary: "stingray - The act of pinching (or biting) a man's scrotum during intercourse," and "Stingray - Being blammed or repremanded for something that a member of your social group has done.
Being stereotyped for the transgressions of your culture, generation, gender etc. and being punished for it."

Somewhat less plausible: "stingray - During sex, you hit the back of the girl's head, flip her over, stab her eyes with a knife, ejaculate on her face, then fuck her dead body."