A sack is a high school prank. This is how its done.

Step 1: Grab someones bookbag.
Step 2: Empty out the bookbag.
Step 3: Turn the bookbag inside out.
Step 4: Put the books back in.
Step 5: Zip up the bag, and have the metal zipper holding things on the inside of the bag

One of the greatest past-times of all time. Also known as hacky sack. Probably invented by a bunch of stoners or perverts that thought it would be funny if they invented a game where you smack a sack around.

Shitty
Autistic
Crappy
Kids
(Not to be confused with autistic/mentally retarded people, only jerks)

1. v. to hit one in the scrotum.
2. v. to fire, esp. from a job.

A humorous insult not particularly referring to anything with complete certainty. Could be referring to the male genitals or something else completely.

A stretchy skin pouch used to house the testicles. Useful for storing a load until it can be squirted onto a girl's face. Especially if said girl likes the taste of ball sweat.