Farting higher than your ass is a common French expression which basically means and boils down to "make believe".
It means that someone wants you, and desperately so, to believe something about them when their truth as a person has absolutely nothing to do with what they project.
Do you know people like that ?
I have met tons of them...online and offline. These are the people who fart higher than their asses.
Beware, and don't be the gullible fool that you probably already are. Read in between the lines, watch out for omissions, watch out for details, scratch hard beyond the veneer....people use masks almost always...unmask and be happy exposing the Farts, for what they are.