A technique done by linemen in the sport of football to deliver devastating blows by using their forearms on the opposing team. Players wore big forearm pads that went out over their elbows and they would practice their craft by thrusting their forearms into blocking bags. Some guys would go so far as to ram their forearms into walls.
"Yo, that dude just clocked the QB with a forearm shiver."
"The ref went ballistic after he was forearm shivered by the 300 pound lineman."
A technique done by men under 140 lbs to deliver devastating blows by swinging their forearms into the abdomen of their opponent from the receiving end of a standing headlock position. It has been said that this counter strike is effective more as a psychological attack than a physical attack.
Andre Johnson should have hit Cortland Finnegan with a forearm shiver before he threw the Lesnar-esc uppercut.
The act of slowly raising your forearm up to a girls throat during sexual activites and proceeding to shake almost uncontrollably. Thus giving the illusion that your forearm is shivering. An amazing sex move usually reserved for the dirtiest of all women.