Meaning behind 'hung smile' as people convinced NSFW term can reveal a man's penis size

Over the years, there's been some particularly bonkers trends about how you can *allegedly* predict a man's penis size.

And while most of them have no factual basis, another bizarre theory has made its way to social media - and this one might be the most ridiculous yet.

According to the likes of X and Reddit, there's something called a 'hung smile' which is essentially a type of grin which people believe could indicate 'big d**k energy'.

In fact, people have been taking to social media with images of certain male celebrities, convinced they are exhibiting the 'hung smile' which is apparently a smug kind of smirk.

One TikToker, @stephenbrenland explained: "Only a certain specific group of men can do this smile, and it’s because they’re actually ‘hung’ if you know what I mean.

"When a man is well-endowed […] he gives this specific smile and it’s not like ‘I’m so happy,’ it’s more like a smug smirk, sometimes with teeth.

"The corners of his mouth don't even go up that much, but they are up a little bit. It just has so much confidence behind it.

"... a lot of men who are hung will use this smile because they know what they're non-verbally saying to you."

Meanwhile, others online have been left convinced that the likes of Superman actor David Corenswet, Evan Peters and Hugh Jackman have all been exhibiting the very specific smile.

To understand more, Grindr's sex and relationship expert, Zachary Zane has weighed in on what it all means.

He explained: "A hung smile is a specific, knowing smirk that exudes confidence and suggests the man smiling is well-endowed. It’s rarely a big, teeth-baring smile, there’s usually a subtlety and a hint of naughtiness, giving the impression that they’re hiding a big surprise in their pants."

Of course, there's absolutely no science behind the trend, with Zane adding: "There’s no scientific correlation between someone’s smile and their penis size, this is purely a playful cultural shorthand."

hung smile whew im weak in the knees https://t.co/LHTpGLYQNs

— zie (@corensups) October 3, 2025

Meanwhile, Dr Rena Malik, told the Diary of a CEO podcast that while you can't predict a man's penis size, there may be one body part that could give some indication.

"There’s one study - it’s a Japanese study where they looked at only Japanese men so there are some limitations - but they measured all these body parts and penile length and they found was that nose length was correlated with penile length, not hand length or foot," she said.