IN BRIEF: "If I let you decide/have your say or exercise influence/inspiration."
The person saying it is usually in total disagreement with the other person or believes the other person is just full of idle talk.
WOMAN: You know what you doing is a bunch of BS, right.
MAN: To let you tell it.
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The definition of let you tell it is another way of saying someone is lying or exaggerating the truth of a subject matter
Let you tell it you are the man the block, Let you tell it you are dating the sexiest women in town, Let you tell it your a wall street stock broker.
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When one person fabricates a Story/Situation to the point where it seems ideal, while another person's telling of the events is, more times than not, more truthful and defamatory.
Ex. Group of guys walk away from two girls.
Girl A: Ugh they were so gross, you could tell they only wanted a Cheap Hook-up.
Girl B: I dunno.. they seemed kinda sweet to me, I Think they were being really classy..
Girl A: Hm.... Let you tell it.
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An expression that intends to contradict what someone is saying without explicitly contradicting them.
Your boy: Yo son, homegirl was feeling me. She gonna text me and we gonna smash my nigga.
You saw the whole interaction, and she was not felling your boy.
You: oh word? Let you tell it.
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When you feel the need to make someone feel dumb by demonstrating your knowledge over a wide variety of subjects, this phrase is useful.
Me: That's not true
Moron: Yes it is.
Me: Let me tell you something... (infinite pause)
Moron: ... ?
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A typical black elder's preamble serving as a gesture of dominance and/or wisdom...
Young Tyrone: I ain't tall enough to be good at basketball.....
Black Elder: Let me tell you something...
"Let me tell you about homestuck" is a joke about homestuck fans trying to tell normal people about homestuck.
Me :' Hey, let me tell you about homestuck'
Friend: 'NOOOOOOOOOOOOO'