The semi-voluntary shaking of one's legs when one has to urinate badly but doesn't yet have an appropriateopportunity. An effort to stave off the wetting of one's pants.
When a woman, or a man, lays down flat on their back with one leg up in the air, at a 90 degree angle. The other partner then takes their foot and sticks it in their asshole, and spins around.
Lets say your at a playground and you see a boy on a stick, you can kind oflook at him as a pinsquat.