The act or practice of using an emotionally unstable (or otherwise un-dateable) person as a sexual batting cage, so as to be prepared for when you step up to bat in a game that matters (see: hottie)
Marty: "So, I hear you've been dating this Emily for quite some time...is it getting serious?"
Jimbo: "Not at all, I just want to be prepared for when I meet a girl that matters to me. Actually, any girl that is capable of spelling would be an improvement over the one I have now. I haven't even stepped up to plate yet, this is still batting practice."
When your on a first date and the bitch your with decides to crank it up a notch, jumps on top of you, wraps her legs around your waist, visciously inserts her tongue into the back of your esophagus, all while dry humping the hell out of your dong.
"Ah man, last night me and Shannon were watchin this movie and then out of no where she jumped on top of me and began Straddle Blasting the fuck outta me!"