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If a poison was fat soluble what does that mean? How would it get into your cell?

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A fat soluble poison would be a substance that dissolves in fat, or lipids.  This type of poison would be extremely dangerous to the body because it cannot be excreted via urine output and could potentially be stored for a long period of time in the fat cells of the body.  Any molecule entering the body must be either water or fat soluble for absorption.  Fat soluble molecules are generally absorbed by fat globules called chylomicrons.  Chylomicrons are specialized lipoprotein particles that carry lipids (fats) to different parts of the body.

A fat soluble poison would enter into a individual cell across the cell membrane.  It will need to be attached to a lipid carrier, chylomicrons.  It can then enter the cell a number of ways, but the most simple is through lipid diffusion.  Because the cell membrane is a lipid constructed barrier, other lipids diffuse or pass through it without expenditure of energy.  This type of diffusion cannot be controlled, making a fat soluble poison all the more dangerous.    

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