"I am already dead"
Deriving from Omae wa mou shindeiru, it is usually used unironically among friends. It is also a cry for help that will be laughed at as you circle into the depths of despair, leaving behind any sanity you possess.
Often used by weeaboos when mocking a whining acquaintance or nearby personnel. Formed from a combination of the whining of "wa wa", and a phrase of Japanese to please their inner weeaboo. The u, is somewhat silent.
Person 1: Damn no one's coming to my anime-themed birthday party this Saturday.
Person 2: Watashi wa, wa wa desu.
Person 1: Fkin weeaboos.