What causes some guys to have a big round protruding knob size belly button?

Well, there are innies and outies.

And there are some innies that go way too deep, and there are some outies that stick too far out.

For the record, mine happens to be absolutely perfect.

The ob-gyn fucked up.

Mine is exactly as intended—neat and clean.

Mine isn’t disturbingly extreme like what OP describes, but it’s an outie. I was born prematurely and with jaundice, and my guess is maybe they rushed a bit quickly to tie the umbilical cord so that they could give me medical care.

OP - Have you ever seen any of these other freaks at the beach?

I have a later-life outie - probably because I'm a little "over weight". I'm not a MAJOR fattie - but I'm and ElderGay and I do have a belly....

For the record, I don’t mind an outie. But when it is as pronounced, as you rarely see, that is what I’m curious about. And maybe people who have any innies we have one that goes just as deep inside as the rare few go outside.

Who is that very famous and handsome Greek TV actor who when you see him without a shirt his belly button makes him totally repulsive?

Desi Arnaz? Soupy Sales? Elmer Fudd?

Jerry Lewis?

John Stamos

Just googled "John Stamos belly button". It looks like a growth in the middle of a gruesome surgery scar.

Yes John Stamos. Always found him incredibly cute but then...

While most outies are completely normal, some people end up with an umbilical hernia which happens when there's a gap in the muscle directly behind the belly button. A section of the intestine can protrude through that gap, resulting in an outie.

I like it on dark skinned dudes with mega meat.

[quote]I have a later-life outie - probably because I'm a little "over weight". I'm not a MAJOR fattie - but I'm and ElderGay and I do have a belly....

= R5 is a MAJOR fattie.

I've got an innie.

Well, this is interesting.

When you’re born, the umbilical cord is cut and you have a small piece left called the umbilical stump. One to 2 weeks after birth, this stump falls off and what remains is your belly button.

As a result, your belly button is essentially a scar. Whether it’s an innie or outie depends on how your skin grows as it heals. The way your belly button looks is mostly by chance.