When because of a disability, a person becomes stuck or trapped in a certain place or situation out in the world. Can apply to anyone on crutches, wheelchair, walker, etc. on anything, stairwell, outdoors, etc.
I saw a guy at the mall trying to get his wheel chair in between two cars but he became totally handitrapped and couldn’t move an inch in either direction.
The specific species of pooping, in which the use of the handicap stall is necessary. That is to say, one is in a rush and must use the handrail for power clenching.