“No, I mean it!”
Your husband cooked dinner. It tastes great. You complimented him on his cooking, but he didn't seem to believe you. You want to let him know that you really do like it, so you say this.
No, I mean it!
Say this when you've complimented someone, but they don't seem to accept or believe your compliment.
A: You're really talented.
B: Yeah, whatever.
A: No, I really mean it!
You look great. I mean it; you really do.
"I mean it" means "I'm serious" or "I'm telling the truth."