The automatic response usually anticipated to avoid an unexpected act they may cause you Insult or injury.
It is an reflexive action.

1. When some one is about to hit you and you do that sudden movement = a flinch

2. Totally cool, Flinchen

And involuntary movement made when someone is about to hit you/you think someone is about to hit you.

Replaces the word "nub", "noob", "nubstick". Refers to a particular GT on the XBOX live network. May also refer to having freakishly large thumbs. Most often used in relation to the Battlefield 3 game on Xbox.

When u hit some one on the back of the neck when they flinch

to flinch the competition : verb - To con more people into buying waterbeds than anyone else

When used as a Noun, "Flinch Flex" is the action when Person A quickly flexes their Arms and Trapezius Muscles and initiates an upper body lunge toward Person B, but quickly retracts the lunge, indicating they never really intended to actually grab, grapple or assault Person B.

The intention of this action is to cause Person B to react has though they were being attacked, and to protect or guard themselves, i.e. "Flinched". By the time they've done this, it has already been made clear that it was unnecessary to do so.

This act is intended to result in the embarrassment, shame or intimidation of Person B. It can be performed 1-on-1 between 2 people, where it is primarily used to intimidate Person B or to cause them to lose their confidence. Or it can be performed in front of a casual or intentional audience, where the goal is to embarrass Person B by tricking them into manifesting their fear or Person A.

It is considered very "macho" to be "Flinch Flexed" on (to be Person B) without flinching. Greater still to endure the maneuver without blinking or even moving your head (Total Badass).

2 for flinching - A game where where you make someone flinch and if they do you get to punch them twice, however if you make contact while trying to make them flinch they get to punch you four times.

A punishment for flinching: Two punches. If the victim flinches again, they'll suffer another two for flinching!

That's just how it works! Don't flinch, Vern!