This porn video tag describes three specific aspects of a male performer's genitalia:
1. Huge: Indicates that the size of the penis is larger than average, often implying greater length or girth.
2. Uncut: Refers to the fact that the foreskin of the penis has not been removed in a circumcision, leaving the penis with its natural, intact covering.
3. Cock: A slang term for the male genitalia, often used in a sexual context.
In summary, this tag is describing a male performer with a large, uncircumcised penis.