Reference to the mostly backwoods or Depression Era practice of running a lit match up and down one’s legs to shave in lieu of a difficult to obtain razor.
I used to watch my Grandma lightin’ the legs; it took mere seconds and seemed so easy once I got past the shock of seeing it that first time!
The female version of "Balls To The Wall." When someone is giving 100 percent effort, totally maxing out, jacked up on Red Bull flying full speed and they are a woman.