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you are exited
The expression is usually, "You could have knocked me over with a feather!" It means, I was so surprised (and distracted or disabled) that I could have been easily knocked over with a feather. In other words, my defenses were way down, or non-existant so almost anything could have knocked me down.
You could of knocked me over with a feather is an old saying. This saying means, whatever was said or done, is so surprising.
that your very happy
Great surprise :0
The phrase "you could have knocked me over with a feather" means that you were very surprised. A person who is so surprised that they are a bit disoriented might feel like something as light as a feather could be enough to knock them over.
I'm very happy and excited
It means that you were so surprised or otherwise emotionally shaken that you had trouble standing up -- so much trouble that it would have taken only the weight of a feather to knock you down.
To tar and feather someone is to smear or cover someone (as the Whigs di to the Tories) with tar and throw feathers over them.
Possibly, other culprits could be wild dogs, cats, raccoons, juvenile delilnquents and last but not least, the weather.
You can be knocked down but not blown backwards.
it means someone is watching over you a guardian angel