In the theme song to Friends, the lyrics are:
So no one told you life was gonna be this way Your job's a joke, you're broke, your love life's D.O.A
In this context what does D.O.A stand for?
For me anyways, I see two meanings:
Dead on Arrival: Which this link seems to agree with, but to me this suggests that you never had a relationship, your dating life was dead before it even started. I don't remember any Friend having a long period of time when they didn't date or gave up dating and declaring it dead.
Dead or Alive: I think this is more applicable, you have times where you're dating and times where you aren't. I think this sums up pretty much all of them. Ross and Rachael both stated that they haven't gone on dates in some time. Chandler offers to help Rachael in one episode and Ross mentioned once that he didn't have sex for a few months, Joey I think was always dating.