What does it mean when someone calls you a microfilament?

I've never heard of such a thing. This is a stretch. I assume he would be referring to the size of his manhood.

It means the person doing the insulting is a geek hoping the other person does not know what the term means. It's like he was calling the other guy a stupid rope.

http://en.wikipedia.org/wiki/Microfilament

Microfilament

Microfilaments or actin filaments are the thinnest filaments of the cytoskeleton, a structure found in the cytoplasm of eukaryotic cells. These linear polymers of actin subunits are flexible and relatively strong, resisting buckling by multi-piconewton compressive forces and filament fracture by nanonewton tensile forces. Microfilaments are highly versatile, functioning in cytokinesis, amoeboid movement, and changes in cell shape. In inducing this cell motility, one end of the actin filament elongates while the other end contracts, presumably by myosin II molecular motors. Additionally, they function as part of actomyosin-driven contractile molecular motors, wherein the thin filaments serve as tensile platforms for myosin's ATP-dependent pulling action in muscle contraction and pseudopod advancement. Microfilaments have a tough, flexible framework which helps the cell in movement.

Let's remove some words for these phrases :

Microfilaments are the thinnest filaments of the cytoskeleton.

These polymers are flexible and relatively strong, resisting buckling by compressive forces and filament fracture by tensile forces.

Microfilaments are highly versatile, functioning in movement and changes in cell shape.

Microfilaments have a tough, flexible framework which helps the cell in movement.

What Does Microfilaments Mean