What does DH mean?

[Jagers Mommy]

I'm sure this is a really silly question, but I can't figure it out! What does DH mean? Also, I know there are other abbreviations like this, can you tell me some others (and their meanings!) too? Thanks guys!! I'm stumped!

Moderator's note: please read the Sticky "Internet abbreviations" thread at the top of this Chit Chat forum.