Tallis refers to female with large, almost god-like calcium cannons. These calcium cannons, when squeezed upon, secrete a large amount of a white, yummy, calcium filled solution that is enjoyed by the whole school. Men, women, and children alike lap that shit up like shrimp fried rice!
Man 1: my god have you seen that Tallis over there?
Man 2: Bro I just wanna guzzle her calcium cannons all night!