The ultimate dare from which a man cannot back down without incurring more loss of dignity than following through with the actual stupidity of doing the dare and suffering its consequences.

A term used to reference cannabis/marijuana/weed.

The ultimate challenge, doing a super hardcore ironman run without Birding, Allies or Loans.

This expression is most commonly used in America. It can be used as another meaning for "You won't do it" or "You won't".

It overall means, you have 'no balls so you won't do it.'

when someone doesn't have the guts to do something.

For effective use: obnoxiously yell “NO BALLS” when someone is attempting to explain their reason why not to do something totally stupid.

Consistent with a dare, like saying I dare you to do something. If a "No Balls" is refused, the refuser therefore has no balls and may be reminded of this constantly; The highest form of a dare to ever exist.

A dare; to challenge to do something requiring boldness and a slight lack of common sense, quite often ending in pain, discomfort, and hilarity. To decline, refuse or back down from a no-balls is an extreme act of cowardice.