Gen Z has created a whole new digital language that has many American adults confused and unable to keep up.

As generations pass, so too do the slang and abbreviations. From the millennial generation on, slang is translated to digital communication via text messages and social media.

Although abbreviations can be convenient for speed writing, especially when texting and leaving comments online, they occasionally add complexity for readers. Rather than saving time, they may result in individuals spending more time deciphering their meanings.

A closer look at Google search results, reveals the thousands of people who are searching for the meanings of various abbreviations daily. A recent investigation conducted by the language education website Anna Spanish searched through extensive Google data to identify the texting code phrases that leave Americans most perplexed.

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To achieve this, researchers curated a list of over 150 widely used acronyms categorized under dating, gaming, business, technology, and general contexts. They dug deeper into the frequency of searches for each standalone acronym, coupled with phrases such as “SMH meaning,” “what does SMH mean,” “what does SMH stand for,” and “SMH definition.”

The final results came up with a list of 40 of the most-searched Gen Z acronyms with “FWB” or “Friends With Benefits” coming in at No. 1. FWB has around 577,190 Americans searching for its meaning every month. The term has gained popularity in the digital age, as individuals often utilize it in text messages and social media exchanges to describe non-committal, casual sexual relationships between friends.

“NSFW” or “Not Safe For Work” is the second most confusing texting phrase with 445,300 searches per month or 5 million per year. The term is commonly used online to indicate that something is explicit in nature and is inappropriate to see or read in public.

Check out the full list below.

“American English is always changing, and it happens more often than you might think. You don’t have to go back centuries to see it,” a spokesperson for Anna Spanish says. “In just the last ten years, hundreds of changes have popped up. Some of them are because of new gadgets and tech stuff. Others happen because people start using words differently.”

“These shortcuts have made their way into all parts of our life, from talking at work to sending texts. You’ll see them a lot in US workplaces, among young folks, and in tech and gaming.”