BUIDL is a warping of the word “build” in the same fashion as “HODL.” HOLD was taken from a typo and then BUIDL was now based from it.
The BUIDL movement believes that instead of just accumulating or trading cryptocurrencies, people should start contributing proactively in order to help adoption and improve the ecosystem people invested.
BUIDLing can involve simply using a cryptocurrency for it's intended purpose, utilizing smart contracts, beta testing products, writing articles, playing blockchain games, using cryptocurrency wallets, and anything that could help the blockchain and cryptocurrency fields evolve and expand.
Currently, it is still not clear as to who first started to use the word. Still, many uses the word.