When a man wears jeans or pants that are too tight in the crotch area and the testicles are extenuated, one on each side of the crotch seam, thus visually protruding like crab eyes.
That guy's jeans were so tight he had crab eye every time he moved his legs.
Usually used when referring to a person that either slightly or largely resembles a crab. You can spot a crab eye straight away by measuring the distance between the eyes, usually atleast 5cm apart.
Although a crab eye could seem quite cute or friendly at first, do not be fooled, as their black beady eyes hold many sinister powers.
Look a crab eye in the crab eyes and it could be the last thing you ever do.
Tom: "OMG check out that crab eye."
Lisa: "EW that's gotta be atleast 10cm on that one!"
Tom: "It's actually quite cute."
Lisa: "Don't look it in the crab eyes!!"
Tom dies.
When someone sends a picture of their lounge view and protruding big toes are exposed. Typically this is an ocean-view with big toes photo-bombing the picture.
Common reaction to such a photo is to write "CRAB EYES!" In the comments
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.