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1.
v. to get utterly and completely OWNED, usually as a result of physical violence.
This term comes from the notorious public beating of Senator Charles Sumner by his fellow Preston Brooks due to his disparaging comments about the south.
(Note: Sumnered is always spelled with a capital "S".)
Wow, Jack Bauer totally Sumnered those terrorist for trying to kill David Palmer.
by A Helpful Troy Student November 19, 2008
 
2.
The act of buying an item out from under someone who had a cash purchase deal pending.
I was trying to buy the cordless drill from Dan when Pete Jr. stepped in and sumnered me.
by SugarShackCowboy August 06, 2014