The lines represent the "cycling" or changes in mood one experiences. This symbol can be used in a number of ways as you will see below.
***Editors: There's an exact replica of this definition and examples that i created under a different word (\/\/\/\). I give you permission and the request to remove the other symbol from urbandictionary replacing it with this modefied version. If you cannot remove it, that's okay but ultimately, please get this new one up on your site. Thanks and have yourselves a good day.
(Alex is manic depressive)
Kimmie was giving me head one second and trying to rip mine off the next, she must suffer from /\/\/\/, more commonly known as /\/\/\/.
(Kimmie was giving me head one second and trying to rip mine off the next, she must suffer from manic depression, more commonly known as bipolar disorder)
Kurt Cobain was /\/\/\/, \/\/\/!
(Kurt Cobain was bipolar, \m/)