A clingy person, this could be a friend, a girlfriend, boyfriend... they cling onto you and demand attention all the time as a barnacle clings to the bow of a ship.
EwTracey is such a barnacle, can we like, scrape her off...?
The barnacle is a sexual manouver where the male spurts his love juice over a woman's bare chest. The woman must let the goo dry forming the 'barnacles'.
The woman then dresses and spends the day proud in the knowledge that someone loves her enough to barnacle her.
"Why is Jill so happy?"
"Her husband gave her a barnacle this morning"
"Lucky bitch."