What is Knee-jerk?
1.
A spontaneous, thoughless, predictable and stereotypical reaction to something, usually an opinion or a statement.
An entire culture of American neo-conservatives has seemed to build itself on a type of knee-jerk reaction to any kind of criticism of the Bush Administration or the loyal element of the Republican Party, even from fellow conservatives -- the kind of pseudo-patriotism discouraged by Theodore Roosevelt.
2.
automatic, quick and without thought
Allergies are the immune system's knee-jerk defensive responses to unknown substances.
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1.
Tits, or in polite company the organs present on the dextral and sinistral sides of the upper ventral region of the human female torso, ..
1.
the act of ejaculation due to masturbation
Ejerkulation is a totally natural thing.
See lol, sex, jerking, off, dick..