2

I have a friend that would consistently say, "I could have told you that," only after the fact is said.

But when I test him before the fact is revealed, he wouldn't know the answer. He has narcissistic traits.

1

I'd say that is a windbag. (And a copycat as well.)

windbag

A person who talks at length but says little of any value:
'I think he’s a pompous old windbag'

copycat

(Especially in children’s use) a person who copies another’s behaviour, dress, or ideas:
'all writers are copycats'

References:
http://www.oxforddictionaries.com/definition/english/windbag
http://www.oxforddictionaries.com/definition/english/copycat

1

Mr.Know it all.. (its a sarcastic way to refer a person who acts as though he/she knows everything) check this for reference.

Reference:
http://www.urbandictionary.com/define.php?term=Mr.%20know%20it%20all

3
  • This has the makings of a good answer. Can you please add a reference and synopsis to it is of greater value to future viewers?
    – Bookeater
    Oct 7 '15 at 7:48
  • @Bookeater - updated with reference :) Oct 7 '15 at 7:51
  • Well-done! I've added it as plain text as well, that is site policy to compensate for link rot. You already had my upvote :-)
    – Bookeater
    Oct 7 '15 at 7:56
1

Sounds like a Monday-morning quarterback to me:

a person who criticizes the actions or decisions of others after the fact, using hindsight to assess situations and specify alternative solutions. [dictionary.com]

0

You could call a person like that Captain Hindsight:-

A stupid ass superhero from the South Park episode Coon 2: Hindsight. He flies around the world providing hindsight after every catastrophy that happens, but doesn't actually do anything helpful. [Urban Dictionary]

although it would be understood only by South Park fans, I guess.

www.urbandictionary.com/define.php?term=Captain+Hindsight

1
  • I like this reference, just wish there's a single word to describe this.
    – sojim
    Oct 9 '15 at 19:40

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