Lackwag
A lackwag is someone who thinks they're tough but can’t even handle a little bit of embarrassment. They’re like a broken toaster, still working, but not in a cool way.
He tried to be the man of the party. Then he spilled his drink on the DJ.
She said she was the toughest in the class. Then she cried when she failed math.
That guy called himself a king. Then he got kicked out of the restaurant.