Term used to describe when someone does not fulfill an obligation to you. Also can be used to describe when someone does not come through for you and you are dissapointed
Yo man that nigga was supposed to come pick me up so we can go to the club, but he left me hangin.
When I was a kid my pops ran off with another woman and left me and my mom hangin.
When someone attempts a high five, handshake or other physical contact greeting and the other person does not reciprocate, leaving them looking foolish with their hand in the air.
Method of waiting within an intersection until the traffic light turns red to make a left turn. Very common in Los Angeles, where there are no left turn signals and often no breaks in oncoming traffic. Apparently legal by necessity in some areas.
Tourist drivers frequently don't understand the LA hanging left, and will sometimes wait through several cycles before making a left turn, often prompting honking and road rage.
Opportunist drivers who illegally follow a "hanging left" driver through a left turn at an intersection. Illegal, since it entails entering an intersection on a red light.