2.)Verb: when your friend farts and will not admit it.
noun or verb.
3.) Exclamation: When in a two-person conversation, someone smells a fart and is sure they did not pass wind but is not sure if the other person has, he/she may exclaim ghost anus to dismiss the idea that the awful smell is in fact from him/her.
Noun: It smells like ghost anus in this museum.
Alexys: So that is pretty much all that really matters in my mind
Sam: Ghost Anus