A toxic person who, despite having many opportunities to succeed in life, consistently makes bad choices which result in professional and personal failure. They usually end up dragging everyone near them into the loser culture, which makes them toxic. The key to identifying a loser is the consistency with which they make bad decisions and their inability to learn from, admit to, and correct their mistakes. Narcissism and low self-esteem are hallmark personality characteristics of a loser.

Someone who puts a name on Urbandictionary.com and gushes about how people who are named that are the best

loser – n. A person who has fallen off the social ladder, climbed down the social ladder, jumped off the social ladder, or just never bothered to climb the social ladder in the first place. Upon arrival on the ground, losers begin to befriend fellow groundlings and realize how much fun a person can have when gravity isn’t an issue. It is perfectly acceptable to insult losers, because they have nowhere to fall to and it won’t hurt much. They will end up laughing about it later, anyways. Every now and then, a loser will glance at the top of the social ladder, but it is never long before they realize how pointless and stupid the top of the ladder is.

A stereotypical term for one who doesn't fit into mainstream society, or is lacking friends. "Losers" are usually really funny, unique, or smart individuals who people neglect to try to befriend in fear that they themselves might be labeled as a "loser".

someone who can't accept their own failure

Someone who purposefully teases and taunts another for their own enjoyment.

Not a winner.