Our guess is that TNT stands for Tina and Tunechi, which are both of the artists' nicknames. Lil Wayne allegedly nicknamed Christina Milian Tina Turn Up.
Milian has been hush about their romance, but gushed when asked what she loves about Wayne. "What I like about him most? You know, theres so many things," she said coyly. "He's a very genuine person. No matter what, love comes first with him and that’s with family, and even with God, and our relationship."
Christina Milian Dating Lil Wayne: 'I Love Him'
In April, Milian admitted to dating Lil Wayne while talking to Big Boy on Real 92.3, and made the confirmation sweeter with three words: "I love him."