When you are wearing Jeans and driving. Because your extended legs to the pedals your jeans tighten up in the crotch area. Anyways,you try and squeeze out a fart,but because you are sitting the gas bubble goes out the front and interupts your idle balls,causing them to move and maybe even flap.
It's the one person who , like a butterfly can't see the beauty of their own wings, but can of others. This word helps them realise, that they are superduperulrasexybeautifulglamorous