"Covfefe" was the No. 1 trend on Twitter across the U.S. early Wednesday morning after President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE sent out what appeared to be an unfinished tweet with a typo.

"Despite the constant negative press covfefe," Trump tweeted shortly after 12 a.m.

Despite the constant negative press covfefe — Donald J. Trump (@realDonaldTrump) May 31, 2017

Many quickly checked to see if "covfefe" was a word. It isn't.

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The lack of a definition led many to invent one for the word, including a pro-Trump Reddit group.

The tweet had over 10,000 reactions in just a half hour. He deleted the tweet shortly before 6 a.m.

Moments later, he asked, "Who can figure out the true meaning of 'covfefe' ???"

Who can figure out the true meaning of "covfefe" ??? Enjoy! — Donald J. Trump (@realDonaldTrump) May 31, 2017

Here are some of the ways people responded to Trump's original tweet:

When they go low, we covfefe. — billy eichner (@billyeichner) May 31, 2017

I like that we all quickly googled covfefe just to make SURE first. — Kal Penn (@kalpenn) May 31, 2017

This is the moment that Donald Trump became President. pic.twitter.com/BrPAPsminu — Kyle Griffin (@kylegriffin1) May 31, 2017

Two tweets diverged in an iPhone screen, and I - I screenshotted the one less coherent. And that has made all the difference. pic.twitter.com/Y7NEzs7QIX — Sopan Deb (@SopanDeb) May 31, 2017

Wow is he trapped in the black lodge? pic.twitter.com/tvcmFw1xj0 — Nate Cohn (@Nate_Cohn) May 31, 2017

ten punk bands just named themselves covfefe https://t.co/jrXdXX1iQ6 — Jason Gay (@jasongay) May 31, 2017

If you can't handle me at my worst, you don't deserve me at my covfefe. — Travon Free (@Travon) May 31, 2017

"And the orb, having bestowed upon you the power to smite your enemies, can be invoked using the simple code word '#covfefe '" pic.twitter.com/jKx255mWDN — Oliver Willis (@owillis) May 31, 2017

"Covfefe" is already the third most popular boys name in red states. pic.twitter.com/SzqqsUlg1z — Krister Johnson (@KristerJohnson) May 31, 2017

Trump is handing out his cellphone number to world leaders & not 1 has the decency to shoot him a text about this? https://t.co/uXNPYbNBNw https://t.co/E14sXIWxmp — Mandy Mayfield (@mandypmayfield) May 31, 2017

Clinton

Offed

Vince

Foster.

Everyone

Forgets my

Electoral college victory. pic.twitter.com/BrHPgUZSOT — Mдтт Иegяiи (@MattNegrin) May 31, 2017

Kathy Griffin: Tonight, I have all of Twitter paying attention to me!@realDonaldTrump: Hold my #covfefe. — Victoria Cliett (@VictoriaCliett1) May 31, 2017

We're all having a laugh but #covfefe was the nuclear code. — Dan Telfer (@dantelfer) May 31, 2017

#Covfefe - you either have it, or you don't. It can't be explained. It can't be reasoned with. It simply is. Much like Donald Trump. — Wajahat Ali (@WajahatAli) May 31, 2017

Covfefe in the streets, covfefe in the sheets. — Zach Braff (@zachbraff) May 31, 2017

--This report was updated at 6:13 a.m.