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1.
plural noun (treated as sing.)
the study of properties of the human vagina, and esp. of the interaction between the vagina and solid bodies moving through it.
-the properties of a solid object regarding the manner in which the vagina accommodates it.
-(treated as pl.) these properties insofar as they result in maximum efficiency of motion.

DERIVATIVES
gynodynamicist --noun
Berkeley gynodynamics experts concern themselves with optimizing glide and minimizing discomfort.
by sweeto April 06, 2008
 
2.
Non offending to those of the female persuasion
You: My Girlfriend has been acting like a sandy vagina ever since I told her that she could loose a few pounds.

Me: You need to learn to be more gynodynamic.
by Every Name is 2u October 13, 2009