A version of the popular basketball game "tip out", aka 21. Basically, a bunch of guys gather around a basketball goal and it's every man for himself, trying to score 21 points. Each normal basket is worth one point, and you get to take free throws after you score, and keep shooting them untill you miss (while everyone else waits for a potential rebound). If someone tips a missed free throw in, it's worth two points.
Mortal tipout is played with no rules whatsoever, and violence is encouraged. Basically, me and some buddies that were too drunk/stupid for our own good came up with it, but it's very addictive.
You might get pushed to the court hard, playing mortal tipout.