Saying something is false means that it would be wrong, and a useless thing to do. When something can be done better or is not at all of satisfactory manor its false.
1. (Verb) To smoke marijuana 2. (Verb) To loudly exclaim the word "false" at someone in order to make a fool out of them.
3. (Noun) A much harsher synonym of no, gets the point across better
1. "Dude Orth lost that bet about the snow day"
"Yeah that means he's gotta go false this weekend"
"Oh Orth"
2. "Did that guy just false me?"
"He did yell it pretty loud"
3. "I believe Orth is not going to be our next President"
"FALSE!"