It can mean a couple of things - either you somehow hurt yourself and become unconscious (for example, you run into something and hit your head) or it's a sarcastic way of saying "go ahead and try your best, I think it's hopeless."
What year did Muhammad Ali get drafted?
Muhammad Ali's final fight was a 10 rounder against future WBC heavyweight champion Trevor Berbick. The fight took place on December 11, 1981 in Nassau, Bahamas. Ali lost a unanimous ten round decision.
Read more: What_year_did_Muhammad_ali_stop_boxing
Who did foreman fight before Ali?
One of the most recogniseable names who fought Foreman before he took on Ali is Philadelphia's Smokin' Joe, Joe Frazier.
How many records did Mohammad Ali break?
first man to win the heavyweight championship three times. fastest heavyweight champion
Arthur Thomas and Kimpo Amarfio