Dry humping or grinding. Sex is intercourse, as in the penis is put "in" the vagina. Fooling around without penetration and staying "out" of the hole is therefore outercourse.
I'm dating this christianchick who's saving herself for marriage. It's not all bad though. We get to have outercourse.
Basically having intercourse, without really going in. Hence, outercourse, also known as dry sex or dry humping. Some people prefer this since there is no direct skin-to-skin contact, meaning... No STD's or pregnancy (usually). Can lead to the point of orgasm for both male and female.