WASHINGTON (CBSNewYork/AP) — A midnight tweet from President Donald Trump has social media trying to find a meaning in the mysterious term “covfefe.”

Trump tweeted just after midnight on Wednesday: “Despite the constant negative press covfefe” — what appears to be the misspelled word “coverage,” CBS2 reported.

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The tweet immediately went viral, with “covfefe” trending on Twitter, and became one of the president’s more popular posts.

Trump poked fun at the typo, tweeting around 6 a.m., “Who can figure out the true meaning of “covfefe” ??? Enjoy!”

Many on Twitter have supplied tongue-in-cheek meanings. One user joked that “covfefe” is already a popular name for babies in states that voted for Trump. Another savvy entrepreneur started selling “covfefe” mugs and shirts.

“‘Covfefe’ is a Yiddish term,” Sen. Al Franken said. “Means, ‘I gotta go to bed now.'”

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Others outside Trump Tower Wednesday morning had their own theories.

“‘Covfefe’ so he’s looking for coffee,” one man told 1010 WINS’ Glenn Schuck.

“He probably hit ‘send’ before he fell asleep,” another said.

Asked about the tweet during an audio-only briefing, White House Press Secretary Sean Spicer added to the mystery, perhaps facetiously, CBS2’s Tony Aiello reported.

“The president and a small group of people know exactly what he meant,” Spicer said.

Dictionary publisher Merriam-Webster checked in with an eye-rolling tweet about people looking up “covfefe” on its website. Dozens of definitions have been submitted the Urban Dictionary website, which crowdsources meanings for slang terms.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)