When someone say something stupid or simple. It's used to annoy people by asking them to tell you more when the statement is final.
Leetal - You're so lame
Johnny - Yah? Tell me more.
Leetal - ..... your lame
johnny - Yah? Tell me more.
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Another way of telling someone to "shut the fuck up" or to silence someone of stupid ideas or talk.
Mark: I honestly don't like animals.
Josh: Tell me more, asshole.
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if you use this sentence the speaker then knows you don't give a shit about his or her speech and that you want to die
9 Year Old Kid: and then I got so many v-bucks *flexes*
Me: oh that's very interesting tell me more
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