a word that translate to complete fatty. usually has horrible dance moves and takes very awkward selfies with people he's met on the streets. A shawn updegraff will also be known for lying a lot and losing a ping pong. usually has no money and begs for money and food.
The result of having upgraded something only to find out afterwards that things are worse than before. Commonly used with the "-ed" ending and/or put in quotes to emphasize its difference from a real upgrade.
Bill: Bob just upgraded his WinXP box to Vista... well, "updegraded" it to Vista.
Jim: Adobe Acrobat Reader used to take about 5 MB of disk space and was very fast to load; now it's slower and uses 150+ MB!... yet another "updegrade".