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The automatic response usually anticipated to avoid an unexpected act they may cause you Insult or injury.
It is an reflexive action.
He flinched when I pretended to piinch him in the face
Related Words
To Enjoy, to be merry, to be happy, to have fun , excitement, flex, live life...
The guy loves to flench! , we were flenching last night, We had loads of drinks and flenched all day.
Flench by Mr flench June 13, 2018

funchline 

Luke Hemmings Sang Funchline instead of punchline in a cover and it was the cutest thing ever like the person who sang it :)
i think your funny when you tell the FUNCHline wrong- luke hemmings - teenage dream -
funchline by Moonlightdeyes April 22, 2016

Fræser Funch

A type of person who rides a bicycle really f*cking fast and smiles a lot.
Thans: "Who is that riding a bike?"
Oba: "Oh, that must be the infamous Fræser Funch
Fræser Funch by pdart603 April 13, 2021

fluncate 

The act of placing one's flaccid penis inside an empty mason jar and filling it with liquid detergent which has been sitting for 24-36 hours in sunlight. Once jar is 3/4 full, a garden hose is sprayed into the jar as you watch shiny fun bubbles exit the jar until penis and testicles are cleansed. 4 out of 5 doctors recommend never spraying the hose directly on the genitals.
It is usually necessary to fluncate prior to and after receiving felatio from Songtan Sally.
fluncate by DEEGEEDEEBEE March 7, 2011

Flinch Flex

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).
I just got Mean Mugged on my way into a Walmart by some little shit 8-year-old Arab kid! It caught me so off guard, that I Flinch Flexed him right back!
Flinch Flex by JesusAli June 29, 2011