It refers to skill or technique of a person to move his/her opponent in order to gain control over them , these techniques does not include use of weapons,to find how these techniques are implemented i included an url www.youtube.com/watch?v=GWDIcAmNnqI . Hope this helps .
Isn't that about the same as playing grabass???
Yes. What made you ask? Are you experiencing difficulties because of the holiday season?
http://www.medicinenet.com/holiday_depression_and_stress/article.htm