A person who turns every conversation into a discussion about how bad their life is.
Someone who always likes to rain all over your parade with their sad looks and sad stories.
Christy: OMG I have the best news! Marie Claire is picking up my article!
Kat: That's great news Christy!! You so deserve this!
Sandy: Wow Christy that is alot of stress to write for such a high profile magazine. I wouldn't want to do that. I just had this operation and I feel like I can barely do anything let alone have a stressful career. Did I tell you guys that I am allergic to the painkillers the doctor put me on and now I think I have this terrible infection, oh yeah and my dog died...blah blah blah blah
(Sandy excuses herself to spread more bad news elsewhere)
Christy: God Sandy is such a sadcloud.
Kat: I know I feel like I should go slit my wrists after that conversation.