I’ve seen it here on the Dope and nowhere else: people using the term “DH” to refer to their SO (significant other). I have the sense that usually it is a woman calling her husband that, but I might be mistaken. But what is it intended to stand for? Da Hubby? Designated Hauler-out-of-the-trash?
Help me out here, folks.
Dear Husband. 
It is used other places as well, I have seen it in use on Etiquette Hell for example.
I believe that it’s “Dear Husband”.
I always read it as Darling Husband.
It’s Dear Husband, just as I thought. Cite.
Sorry, when I see “DH” my mind automatically reads “designated hitter.”
I’ve always read it as Dear Heart, but then that’s my own bias based on what an ex used to call me.
I’d like to know if DH as Dear/Darling Husband is meant to be sarcastic.
Probably it is sarcastic sometimes, but I would say not usually given the context I have seen it used in.
Well, it seems to me that a husband can be thought of as a designated hitter of sorts; he gets to swing the bat without taking the field, so to speak.
Thank you so much; now I will be able to sleep tonight.
And depending on how you’re feeling about said husband, it can also mean “Damn Husband” or “Dick Head.”
You might also come across DD (daughter), DS (son), DGM (grandmother), DMIL…you get the idea.
Not likely! 
(Yes, I’m kidding)
I can’t remember ever seeing it here on the SDMB, thus I doubt if it is “Doper slang”.
I saw it (DH), here on the Dope just in the last two days, but it’s not what I would call Dope-specific slang. I’ve seen it on many message bards. BTW, I always read it as sarcastic but that’s just me. 
It has been used on the boards, but I don’t think it’s exclusive to them.
Another alternative meaning would be “Dependant Husband” (or DW, DC for wife and child) refering to the non-military (and therefore dependant) family members of military personnel while on base or dealing with military paperwork. Actually, though, I’ve seen it mostly as D/H, and D/W etc.
Not that I’ve ever seen THAT usage used here, but when we lived on a military base in Germany, we saw it a lot and so it’s actually the first thing I think of. There was a D/ (“D-slash”) club on base.
Wasn’t there a columnist in the 60s who referred to his wife as the BW (beautiful wife)? I always assumed this was related to that. (Earl Wilson maybe?)
By the way, what does BTW stand for? 
I [*U]think * I’m being whooshed but just in case I’m not: BTW means “by the way…”