Definition (courtesy of London dictionary of losing basketball teams):
Sixering: To commit an act during an NBA game of greater than normal ineptitude, lack of common sense or to suffer an unlikely successful play by the opposition at a crucial time that proves costly to the Philadelphia 76ers.
For the most hardy fans of the 76ers, those who actually followed the games during the heart of ‘The Process’ (2013-16,) the phrase ‘Sixering’ brings back painful memories.
The Sixers have a lot more people interested now, both in person, TV or in the media.