the peanut butter shot is a penicillin shot in the but cheek that is thick like peanut butter is it true they stop giving those in boot camp unless you have a STD
He means the basic training ass shot. You know.... arms up on top of the partition, all your weight on one leg, then the maniac comes by and stabs you with his huge ass needle, which feels like he just stabbed you with a PVC pipe, and he's trying to squeeze in a tennis ball into your cheek.
That's the same day you get all your other shots, and smear your DNA on to the DNA card.
I'm not aware of the Corps or any other service ever giving antibiotic injections unless the individual had been diagnosed with a specific condition that warranted such treatment. It has been medically known for decades that the indiscriminate use of antibiotics causes them to become ineffective since the bugs they are meant to combat become tolerant of the antibiotic.
BTW, penicillin hasn't been used for most STDs for over 30 years now. Most STDs are penicillin resistant.