Waste time on bottom feeder websites like this.

Use a smart phone. Studies have shown a 40% decrease in IQ for those that use their smart phone for social apps and texting.

Watch tv and use facebook.

Watch everything about the Kardashians.

Listen to the news, believe everything you read, smoke alot of pot, stop reading, let others tell you how to think, spend countless hours watching porn, stay away from good influences like teachers preachers church, Kiwanis, family

Do not get an education.

Listen to music a lot, smoke doobies

[media=https://www.youtube.com/watch?v=wM-AjXOabx8]

hang out with dumb people

Probably the best means of getting really stupid is be a liberal millenial.