A condescending asshole who goes everyhwhere with their blue tooth head piece on, even when quite inappropriate. They are always speaking vociferously with no regard for others around them.

A blue-tool is a person that wears a blue-tooth headset 24/7, just to look cool. In extreme cases the blue-tools in question were found to have worn their headset even without the phone.

Someone who uses their bluetooth headset to listen to music, thus giving the appearace to those who don't realize this that they're just showing off that they have one. Actually, they're just people smart enough to realize that Ipods earphones have cords and you can do just as much with a decent cellphone.

Penile equivalent of blue balls.

Someone who is a total tool, but you cannot refer to them as a tool because they are your "friend" or you are related to them.