milkshake duck

Etymology
From a Twitter post by Ben Ward (pixelatedboat) on June 12th, 2016: "The whole internet loves Milkshake Duck, a lovely duck that drinks milkshakes! *5 seconds later* We regret to inform you the duck is racist".

Noun

 * 1)  Someone or something, especially on social media, that is widely considered to be endearing, but is then discovered to be or have done something deeply flawed or distasteful.

Verb

 * 1)  To reveal (someone or something recently beloved by the internet) to be a milkshake duck.