The backflip itself is a cool movement, where a person rotates preferably near a 360 degree angle backwards. Being able to perform and land this defines you as cool.
Try to look in the direction the insult came from, causing her to fall and result in a massive crater,
Will attempt to actually do a backflip off of the jump, usually ending up with the fat bitch plowing through the jump, or leaving half an inch above the jump and landing on her ass.
It is also best to add a hand gesture, such as a rotating your fist in a circle, like that of a backflip.