DDDD /ˌdiː ˈdiː/ 
1the written abbreviation of direct debit2(Doctor of Divinity) an advanced university degree in theology (=religious studies)3(darling daughter) used on the Internet to refer to your daughter. You refer to your eldest daughter as DD1, your second daughter as DD2 etc: 
DD1 came home from school in tears today.
1the written abbreviation of direct debit2(Doctor of Divinity) an advanced university degree in theology (=religious studies)3(darling daughter) used on the Internet to refer to your daughter. You refer to your eldest daughter as DD1, your second daughter as DD2 etc: DD1 came home from school in tears today.