A sacred dare that occurs when somebody states they will do something, saying it in a sarcastic way or not realising they said it, somebody else around them then says "man challenge" which then forces that person to do what the said or else they will receive a kick to the balls. The only way to get out of a man challenge is for the person who administers the man challenge to say "Revoke" which takes away the man challenge.
Is the person who receives the man challenge does not do the act they were challenged to do and refuses to take their kick to the balls they are stripped of their ability to give man challenges to other people because they are now viewed as a pussy and hence the name can not give "Man" Challenges.
John: Hey Chris u should go smack that girls ass
Chris: Ya dude, I'm totally gonna do that
John: Man Challenge