A non-Newtonian fluid is a fluid whose flow properties differ in any way from those of Newtonian fluids. Most commonly the viscosity of non-Newtonian fluids is not independent of shear rate or shear rate history. However, there are some non-Newtonian fluids with shear-independent viscosity, that nonetheless exhibit normal stress-differences or other non-Newtonian behavior.
To understand this phenomenon, you can put slowly a spoon in a honey jar, it sinks easily as the honey moves around it/away from it. If you put the spoon in much faster, it seems to almost tense up and is harder to do so.The non-Newtonian fluid is resistant to high impacts but weak to a constant low force, like we can see in the video:
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