President Donald Trump has never been shy about giving his opponents nicknames — "Crooked Hillary," "Lyin' Ted," "Crazy Bernie," "Goofy Elizabeth Warren," "Low-energy Jeb" and "Little Marco" all immediately come to mind — and now North Korean leader Kim Jong Un has his own Trump moniker.

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“Rocket Man” is the latest of Trump’s derisive epithets.

On Sunday morning, Trump launched Kim's new nickname into cyberspace.

>> See the tweet here

"I spoke with President Moon of South Korea last night. Asked how Rocket Man is doing. Long gas lines in North Korea. Too bad!" Trump tweeted.

The "Rocket Man" nickname is a clear jab at Kim Jong Un's now semi-regular missile launching over Japan.

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The most recent launch happened Thursday. North Korea has fired at least 21 missiles since February 2017 in 14 missile tests.