The meaning of 'Dimelo'
Seb, I said: decir.
Once you find it, you add the pronouns. of course, it would be much easier and shorter to tell you, but that would not help you
Di (say)-me(me)-lo (it)
The pronoun "me" is an indirect object pronoun and takes on the meaning "to me" or "for me." Which is why you have "Say it to me" rather than "Say it me"