What exactly flacconage means?

Flaccid is an adjective that means lacking firmness, stiffness, or tension. It is often used to describe something that has become soft or droop.

For example :

A flaccid balloon

Flaccid muscles

Flaccidity is a noun relating to how flaccid something is - the condition of being soft or drooping

For example:

The flaccidity of his leg made walking difficult.