The use of "thank you nostradamus" began in 2014 from within the video game World of Tanks by Whane The Whip. The phrase is sarcastic and used whenever someone make a ridiculous claim of foreknowledge.
Joe: I haven't seen my ex in years.
Fred: You will bump in to her next week, just you wait.
Joe: Thank you Nostradamus.
Fred: You will bump in to her next week, just you wait.
Joe: Thank you Nostradamus.
by Whane The Whip September 10, 2014