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1.
when there is nothing left to say!

when you could use more choice words but decide to be nice.

works in almost any situation.
like when you are not really listening to some one but dont want to be rude so you acknowledge them.
with a, yeahwell

or when someone is not so nice to you
A pat reply instead of playing there game, or in place of (whatever)
YEahwell!
by YEahWell May 13, 2005