What is Slack Class?
1.
A class that is extremely easy. Usually, you do nothing in the class and you still get a good grade. People who take all slack classes are called "slackers" because they are lazy.
Dude, psycology is such a slack class. No one does anything and they all have A's.
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1.
Rubbing one's penis vigorously back and forth in an ass crack, while not actually inserting it in the anus. Also known as the asst..