• An NFT investor said he jokingly offered to sell an Ethereum crypto wallet address for $150,000.

• He sold it for $2,900 but forgot to cancel his offer, allowing the buyer to sell it back for the original amount.

• "This will be the joke and bag fumble of the century," he said. "I deserve all of the jokes and criticism."

A big-time NFT investor who owns 57 digital art pieces from the Bored Ape Yacht Club said he lost $150,000 via a joke bid.

Investor Franklin Caldwell, whose Twitter handle is @franklinisbored, said he lost the 100 ETH by jokingly bidding on a so-called Ethereum Name System (ENS) domain, which is basically a crypto wallet address in readable form that is minted as an NFT.

He appeared to be mocking how some users do this often, creating phony domains with fake bids so that a Twitter bot called EnsBidBot would tweet about the offer.

ENS domains are the crypto world's way of translating complex wallet addresses so that we can read them more easily — the addresses typically are 42 characters long and begin with "0x." It's a little like how traditional websites use the Domain Name System, or DNS, to turn regular .com domain names in your browser into IP addresses that help computers find a website.

If you've seen people like comedian Jimmy Fallon and actor Anthony Hopkins with a ".eth" at the end of their Twitter profile names, that is likely their domain name for their ETH crypto addresses.

According to Molly White — who keeps the world tuned into cautionary crypto tales with her blog "Web3 is going just great" — Caldwell created an ENS domain called stop-doing-fake-bids-its-honestly-lame-my-guy.eth and placed a 100 ETH bid on it.

He thought he'd had the last laugh when someone offered him 1.9 ETH, or about $2,900, for something that amounted to a joke. Caldwell accepted before realizing the person was able to turn around and make off with his 100 ETH since he'd forgotten to cancel that offer.