Elon Musk may have bowed out of a cage match against Mark Zuckerberg, but apparently he is still up for the challenge to measure his manliness against the Meta CEO.

Literally.

In yet another eyeroll-worthy childish tweet by the Twitter CEO, Musk lashed out at Zuckerberg writing:

"Zuck is a cuck."

Meta's new text-based conversation app Threads launched on July 5 and already has secured more than 100 million accounts.

Perhaps Musk was a tad bitter because later that day, he followed up with a tweet challenging Zuckerberg to a "literal d*ck measuring contest."

No, seriously.

A 52-year-old manchild was so upset by free-market capitalism at work, he threw another online tantrum and challenged a business competitor to drop trou and measure their penises.

Check it out below.

@elonmusk/Twitter

Though completely on brand, many users expressed their disappointment over the puerile tweet.

Zuckerberg has yet to respond to Musk's latest proposition.

Probably too busy on his new app.