What is a Stage Five Clinger???

What do you consider a stage five clinger?  I keep hearing people talk about stage five clingers and it got me thinking.

Here is a quick explanation that I found online about stage 5 clingers.

''''''A member of the opposite sex that is likely to become overly attached, overly fast. Virgins, those on the rebound, and the emotionally fragile are more likely to have this term applied to them. Orignally from the movie Wedding Crashers.
We need to get Nick away from that chick. She's a stage five clinger.

We've got a stage five clinger situation. I need someone running interference on the blonde behind me, now.

I nailed that chick last weekend and seriously regret giving her my number - I'm getting 2 or 3 calls a day. I think what we've got ourselves here is a stage five clinger.'''''''''''

Nice Post contribute here friends.I think we all agree that the "Stage-5" expression can be understood to mean "extreme", even though we don't know exactly what the author had in mind.