A painful swelling, normally in the thigh, caused by a punch or quick blow. Bruising and discoloration tend to follow dead legs and leave the victim with a numb leg that is hard to walk on. Normally occurs between guys but rare instances of girls giving guys dead legs have been discovered. Also known as a Charlie Horse.
Claire: Hey I don't know what a dead leg is.
Will: Hey you're right.
where you punch someone (not kick cause only punching works otherwise its not called deadlegging) in the area between the ankle and calf on the lower leg, causing the person to collapse or yell in tremense pain.
Oh shit Libby just deadlegged jonnie and now he is crying like a baby on the floor!