can be used to describe any interesting situation your friend happens to get yourself into. Saying it gets you out of all explaining to anyone who may ask, as they also will know what "a morgan thing" is, so no further explanation is necessary.
It typically involves getting lost a few times, doing some spontaneous things, and basically having a good time. Nothing goes as planned, but everything works out fine in the end :)
"oh, hi dad...yeah, i'm at this Crashed ice event and then we're...don't worry, it's a Morgan thing."