"manslaughter,
(n) the act of causing the death of another person; categorized as involuntary or voluntary. Involuntary manslaughter indicates that the death occurred during the course of a crime or as a result of negligence, whereas voluntary manslaughter involves a suicide pact, incitement, or diminished responsibility."
Jonas: Mosby's Dictionary of Complementary and Alternative Medicine. (c) 2005, Elsevier.
What you may be talking about is "Aggravated Assault With A Deadly Weapon." "Getting pissed" and intentionally shooting someone falls under this definition. Now, if the person you shoot happens to die, that is "Murder 1."
THE WEEKLY VICE: Holly Solomon - Jailed After Running Husband Down With SUV Because He Failed To Vote
Now, THIS is 'assault with a deadly weapon.' If the guy had died from being struck, it is very possibly 'pre-meditated murder,' based on Solomon's "reason" for running the guy down.