2, An extremily wide punani, so called because of the imposible-to-hit shot in bowling
3, When the space at the top of a woman's legs is very far apart, usually indicating definition 2.
2, Charmaine's been fucked so many times that she's got a 7-10 split!
3, Tiffani's too much of a sket. Look at her legs! For christ sakes shes got a 7-10 split!
While fingering a girl after doggy style (using two fingers), insert your thumb into her anus which is similar to the way you would grab a bowling ball with finger holes. Then proceed to "roll her" into the headboard/wall.
The name comes from the fact that it is almost impossible to get a spare after a 7-10 split, and it will likely be impossible for you to have any future relations with this girl if you pull it off.
Guy 2: Dude, just give her the 7-10 split, she'll never call you again.
Guy 2: "Did you pick up the spare on that shit?"
Guy 1: "You know it, bro!"