Let me have it!
let (one) have it
To verbally attack or strongly reprimand one. When the boss finds out that I was responsible for this printing error, he's really going to let me have it.
let me have it
Tell me the (typically bad) news or information. A: "We've got our financial reports for the last quarter." B: "OK, let me have it. It sure couldn't be worse than the last one." A: "Dan, there's something I need to talk to you about, but I don't know how to go about it." B: "It's all right, Tom. Just let me have it."
Let me have it!and Let's have it!
Inf. Tell me the news. Bill: I'm afraid there's some bad news. Bob: Okay. Let me have it! Bill: The plans we made did away with your job. Bob: What? John: I didn't want to be the one to tell you this. Bob: What is it? Let's have it!