Top definition
When you accept the rules of a game, riddle, or challenge, but then instantly back out of the consequences when you lose or fail miserably.
Matt agreed to the rules of the FB riddle, but his soreloserism went on display when he refused to change his profile picture to that of a llama.
by @nobody December 15, 2016
Get the mug
Get a soreloserism mug for your cousin Trump.