Uhh fuck me eyes, as in the facial expression?

It's like, mostly closed eyes, usually at an angle, like looking up through your lashes at the person you're giving the look to. Sometimes combined with biting the lower lip, pouting a little, or licking your lips.

It doesn't sound sexy on paper, but it's definitely pretty hot visually.

I’m pretty sure it’s the sound of any hair commercial. Just assume women in hair commercials are making that face when they talk.

It's not really a distinct "thing", but it is generally associated with smiling, unbroken eye contact.

Can be considered creepy in uncomfortable contexts.

Probably similar to the sexy voice people do sometimes. Don’t think you’re missing out. It’s more of a trope than something people do regularly.

Okay, here is my best attempt at an explanation. "Fuck me eyes" are a bit like flirting in general, in that it's highly subjective. But if I were trying to give someone instructions on how to do it, I would tell them to let their gaze linger on someone (that you have a rapport going with! Otherwise you're just staring creepily) while smiling warmly.

There's a "tease and denial" element to flirtation. Like, you might gaze warmly at someone, or appear to be visually enjoying their body, but then pretend disinterest, as though something else, or someone else, distracted you. Some people might avert their gaze this way while flirting because they want to see the other person display more interest first, or simply because they feel shy.

But anyway, when you do the dance of visually admiring someone and vibing with them, up to the point where it might be typical to look away demurely, and instead you double down - gazing at even greater length, or smiling even more warmly - that's when you've decidedly crossed the line from "flirting" and into "fuck me eyes."

tl;dr the duration of a (welcome) sexual gaze expresses interest level; brief glances express a "will they / won't they?" level of interest; longer, warm gazes express something more like "come and get it"

You know how people can show emotions with their facial expressions? These expressions are innate and even blind people do express them, although a bit differently than sighted people ($1, I hope the article is accessible).

The way how eyes behave is big part of those expressions and most sighted people can deduce the emotions of a person just looking at the picture of their eyes. The way how emotions can affect the pupil size is one of those tells.

I'm not entirely sure does the eyes of the people, who have been blind since birth, express the emotions in similiar way. At least for sighted people the pupil size is involuntary and they have little control over it, so it might be an innate thing just like the facial expressions.

So long story short, most sighted people can instinctively read emotions and feelings just by looking people in the eye, including passion and lust.

I don't understand your question. You want to know how to make a facial expression that says "Fuck my eyes?" Why? This is such an immature question.