Implied Answer

Someone does not directly answer a question (and might not technically respond at all)--but still makes him/herself crystal clear. The person who asked the question may then reply "I'll take that as a [yes\no]".

Inverse of:

Non Answer: when someone directly responds with something so vague it's not an answer at all.
Mathematicians Answer: when the response is direct and absolutely correct, but is utterly useless anyways.

Examples

Film

From Pirates of the Caribbean: When Davey Jones asks Norrington "Do you fear death?" Norrington runs Davey Jones through before expiring.
From Ocean's 11:

Danny: Ten oughta do it, don't you think? Rusty: [Stares of in silence, not looking at Danny] Danny: You think we need one more? Rusty: [Silence] Danny: You think we need one more. Rusty: [Silence] Danny: All right, we'll get one more. Rusty: [Blinks]

Webcomics

In Exterminatus Now, Lothar is fighting some dragons. The others ask Lothar if he'll be okay. They take a dragon's head bouncing off a wall as a "yes".

In this Black Eye Comics episode, someone flirtatiously asks if the cashier is going to pay for her sandwich. His only "answer" is to give her an irritated look, and she unhappily digs through her purse for money.