The phrase "uncircumcised penis" refers to a penis that has not undergone a surgical procedure called circumcision, which involves removing the foreskin that covers the tip of the penis. Full definition
A bit of trivia for those of you unfamiliar with uncircumcised penises — the foreskin should never be forced to retract before it is ready. (crunchydomesticgoddess.com)
Your baby's uncircumcised penis doesn't require any special care, as it will be some time before his foreskin retracts. (verywellfamily.com)
I looked down and saw what looked like a little uncircumcised penis. (abitbackward.com)