L8D8

L8D8 is a "Late Date"

L8D8 is a short (contracted) form of L8 D8: i.e., Late Date

L8 D8

L8 D8 is a "Late Date". Specifically, L8 is an acronym for "Late" (i.e., L-eight) and D8 stands for "Date" (i.e., D-eight)

Hey, I really need to leave early tonight - Cuz I have a L8 D8.