"Hardcore" in the context of porn videos refers to explicit and intense sexual content. It usually includes scenes such as rough or aggressive sex, close-up and detailed shots of sexual acts, and sometimes BDSM (bondage, dominance, sadism, masochism) elements.
"Twinks" is a term used in the gay porn industry to describe young, slender, and often hairless men with a youthful appearance. Twinks can vary in terms of ethnicity, hair color, and eye color but are generally on the younger side of adult performers.
So, "hardcore-twinks" is a tag for porn videos featuring explicit and intense sexual acts performed by young, slender, and often hairless men with a youthful appearance. These videos often involve rough or aggressive sex, close-up shots of sexual acts, and sometimes BDSM elements.