extracurricular activity

1. Literally, an activity that a student does in addition to their studies (the curriculum). With your grades and extracurricular activities, you'll get into any college you want. You didn't list any extracurricular activities on your application. Aren't you involved in any teams or clubs at school? My extracurricular activities include cheerleading and French Club.

2. slang Sexual activity, often that which is clandestine. If Jen didn't come home last night, I bet she and Bill were preoccupied with some extracurricular activities, if you know what I mean. Good luck sneaking in extracurricular activity with your wife now that you have kids. Judging by their various states of undress, I'd say they were engaged in some extracurricular activities when we stopped by.

3. slang Fighting or arguing that occurs among competitors during a sporting event. It looks like both teams were flagged for some extracurricular activity after that last play. These two teams hate each other, so the refs are going to have a hard time keeping the extracurricular activity in check. Don't get sucked in to any extracurricular activity with their goons, OK?