Typically used with the preceeding pronoun "her", a metaphor used when having sex/
nailing/fucking a girl (commonly referred to as a slut, hoe or bitch) so vigorously that you could visualize splitting her in half up the centre (or
up the back, respectively). Usually referring to a slim tall girl, or a cute, tiny petite one.
Often used in the degrading sense by a male among his peers to raise his
esteem.
"I picked up the hottest slut at the bar last weekend: she was blonde, fit body,
tight ass;
the works. We're going out for drinks tonight :D.... I cant wait to
take that bitch home and break her in half!"