overlapping of thumb and middle finger under the pointer finger. used as a pinching technique. grab someones skin between thumb and top of middle finger, it will hurt. this is not called a turtle bite.

When a male puts his fingers into a female's vagina and begins fingering her, meanwhile he clamps down on her pelvic region with his thumb imitating the bite of a goose.

Beretta Bite is the wound suffered when the shooter wraps the support hand over the shooting hand where the slide will recoil and take two chunks of flesh out of the higher thumb (one for each slide track). It may be simply painful up to being bloody and requiring stitches to close up the wound.

an injury caused by the recoil motion of the slide on a semi-automatic pistol. typically caused when the shooter has his or her thumb in the way.

The process of taking ones thumb and placing it between the pointer finger and middle finger then pinching someone with your thumb, resulting in the most painful pinch known to mankind

Actually, Shakespeare never used this specific phrase. If he had, the gramtically correct way to say it would be "I bite my thumb at thee!"

a dynamic pinch executed between the thumb and the middle finger, braced by the index finger for added leverage thus increasing the pain ten fold