Forensic linguist Jack Grieve has mapped the spread of slang like "bruuh," "baeless" and "on fleek" across the United States, using Twitter data from October 2013 to November 2014. Some slang, like "on fleek," exploded in usage over the course of just a few months, while others slow burned into our lexicon. 

Watch slang like "bruuh" and "on fleek" spread across the United States. Image 1.

Watch slang like "bruuh" and "on fleek" spread across the United States. Image 2.

“We know almost nothing about how new words spread, and this is a way of really seeing it,” Grieve told Quartz. “It’s pretty exciting to see real-time how words that are current are spreading out.”

   

facts about the spread of slang: 

 "African-American English" is largely responsible for the spread of new slang. Phrases start on "Black Twitter" then go into common usage from there. 

 The South is probably the most influential region for slang. Boolin, baeless, bruuh and unbothered all started there.