what is shenpa:

Not Biting The Hook
In Tibetan there is a word that points to the root cause of aggression, the root cause also of craving. It points to a familiar experience that is at the root of all conflict, all cruelty, oppression, and greed. This word is shenpa. The usual translation is attachment, but this doesnt adequately express the full meaning. I think of shenpa as getting hooked. Another definition, used by Dzigar Kongtrul Rinpoche, is the charge”—the charge behind our thoughts and words and actions, the charge behind like and dont like. Heres an everyday example: Someone criticizes you. She criticizes your work or your appearance or your child. In moments like that, what is it you feel? It has a familiar taste, a familiar smell. Once you begin to notice it, you feel like this experience has been happening forever. That sticky feeling is shenpa. And it comes along with a very seductive urge to do something. Somebody says a harsh word and immediately you can feel a shift. Theres a tightening that rapidly spirals into mentally blaming this person, or wanting revenge or blaming yourself. Then you speak or act. The charge behind the tightening, behind the urge, behind the story line or action is shenpa
You can actually feel shenpa happening. Its a sensation that you can easily recognize. Even a spot on your new sweater can take you there. Someone looks at us in a certain way, or we hear a certain song, or walk into a certain room and boom. Were hooked. Its a quality of experience thats not easy to describe but that everyone knows well. 
Now, if you catch shenpa early enough, its very workable. You can acknowledge that its happening and abide with the experience of being triggered, the experience of urge, the experience of wanting to move. Its like experiencing the yearning to scratch an itch, and generally we find it irresistible. Nevertheless, we can practice patience with that fidgety feeling and hold our seat.
~ Pema Chodrin