In the south a blowed out bitch refers to a girl that has been around the block a couple of times and then again. Basically a nasty whore that sleeps with other girls boyfriends or really anyone that will sleep with them(girls, boys it doesn't matter to them). They think they are the shit, but, they are really broke, scandalous, sneakin assbitches, that have literally been blown out.
Jane: Hey girl what's bothering you?
Tina: Well I just seen ole girl talking to my boyfriend.
Jane: Oh don't sweat that blowed out bitch she ain't shit.
Tina: Yeah I know but, I don't like her.
Jane: Me either.
To shamelessly pull out of an event in which you have a vested interest and/or are expected to attend by a large number of people. This is usually done at the last minute with a lame ass excuse. Similar to bowing out but more extreme, considered extremely small time.
Dude 1: I was really looking forward to this ski trip, but where the hell is Dude 2?
Dude 3: O ye, after bigging himself up for it all this time he bower out (bowered out)