Why did i throw up black liquid?

For the past few weeks i have been sick and the only symptoms i have been experiencing are really bad coughs and headaches. I Havnt been drinking,ive had a few cigs like 3 times a week. My gf got me sick as well. she had bronchitis and i still kissed her and we have had sex many times. so yesterday i was eating a bowl of top ramen chicken flavor soup and i was coughing more then usual that day. and about 20 minutes after eating the soup i continue to cough and eventually throw up. i through up all the soup along with this black liquid. ive had no stomach pains or any other symptoms. Whats going on?
-my friends told me that i should see a doctor because i may have thrown up blood that was sitting in my stomach for a while.

[avisg]

you friend was right go see the doctor ASAP

[owhatamistake]

Black liquid usually means old blood.  I'd see a Dr. immediately.

[122 Tactical Fighter Group]

I hope that you are gone by now because that is exactly what you should be doing.....this is no joke here .......it can be serious ....................................

[wannabefree330]

Blood that has been sitting in stomach and partially digested turns black.  Thats why it isn't red like if you had cut yourself. Get to the doctor .....yesterday.

[Josh117]

Ok thank you very much everyone