a turn is an emotion, caused by immense stress, sadness, and/or anger. it can come over a course of a few minutes, or instantly.
turns are fueled by anger and sadness, and usually result in lashing out against others and things around you.
it is very dangerous to be around someone when they are having one of their turns. turns can only go away after the individual having one calms down, in which they'll return to a state of depression and sadness.
First coined in the song "One of My Turns" by Pink Floyd.
"and I..can...feeeeeeel....one of my turns comin' on..." -Pink Floyd
"Leave me alone...I can feel one of my turns"