One who is willing to engage in the delicious act of Docking.
Down to have foreskin stretched over their head, down to stretch their foreskin over anothers head.
Micheal: "OMFG i'm so DTBF(Down to butt fuck) right now"
Austin: "fuck thatpussy shit, i'm DTD!"
Micheal: "Fuck yes! And after I want you to shit all over me face..."