This is a
tongue twister - also a
drinking game (probably a lame one, since
my mom taught it to me
twelve years ago).
Person A starts with the first item, saying it aloud.
Person B (or
Person A if he has no friends) follows with the
first item,
concatenating the second item.
Person C (or
Person A if you only have one friend) follows with the first two items, adding the third,
and so on.
Disclaimer: I learned this aurally, so it might not be dead accurate with the way you know it. Wait, my mom's a freak...no one in their right mind would know this.