I never could figure out what DS meant...(dear son)

Lise uses one- MWBR- more will be revealed.

Some people use DPITA- dear pain in the azz

SO- significant other

BF- boyfriend

I used to have a girlfriend who had a BF and eventually fiance who she called Boyfriend, all the time, like that was his name, and that was the name we all knew him by. It was cute.