that [as opposed to this]
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那个比这个好。
That one is better than this one.
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那个人真让我受不了。
I can't stand that man.
that thing/matter
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再提那个就是多余的了。
It's unnecessary to mention that again.
[used before a verb or an adjective for emphasis]
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他那个高兴劲儿就甭提了。
His ecstasy is beyond description.
[used euphemistically or humorously to replace sth funny or embarrassing]
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你也太那个了。
That's going too far of you.