It is the truth. (Can be posed as a question as well as a response.) A: "You really said that to him?" B: "No lie—you should have seen his face when I did!" A: "They said I'd be getting a 20% bonus this year!" B: "No lie? Wow, that's fantastic!"
Inf. You are not lying, are you? Bill: A plane just landed on the interstate highway outside of town! Tom: No lie? Come on! It didn't really, did it? Bill: It did too! Tom: Let's go see it! Bob: I'm going to take a trip up the Amazon. Sue: No lie?
See also: no