Very similar to the dirty sanchez. The rusty edge is when reminence of feces are left on the penis from anal intercourse representing the rusty edge of a sword. The rusty edge should be used to titty fuck or mark your sexual partner with an 'X'
Jeb: Gee, Monica is doing butt stuff with everybody these days
Bill: Someone ought to give her the ol' rusty edge
Bill: Someone ought to give her the ol' rusty edge
by bambambambambamambam February 29, 2016