Like the ever popular 'touché', oneché is a form of touché just half as good. This is used when one admits that the other person is correct, or makes sense, but not to the extent of a full touché.
example of touché:

"why is sarah divorcing mark?"
"mark had an affair with about 34 different women, including sarah's sister"
"touché"

example of oneché:

"why is sarah divorcing mark?"
"mark's ugly as hell"
"oneché"
by The Greatest Bambino July 4, 2009
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