A patheticly stupid individual who often will either say or do something incredibly stupid for no real reason. These things should be avoided at all costs but becuase there are more water sacs than intelligent people.
Derived from the fact that humans are 75% water and because a water sac has no brain; it is primarily water.
Foolishly believeing you have fallen in love with someone only to discover that you are not, you are in fact an idiot, and do a complete turnaround to retrace your steps exactly the way you entered into the situation.
To understanding friend: Thought that I'd met Mr Right, but it seems we have gone down a love cul-de-sac and I have to get out!