BUIDL is like the battle cry of the crypto developer community - it's a rallying call to stop speculating on prices and start building cool stuff with blockchain technology.
The term is a play on "HODL," which itself is a drunken misspelling of "hold." But while HODL is all about holding onto your crypto for dear life and never selling, BUIDL is about rolling up your sleeves and actually creating something useful with your skills and knowledge.
Example
"I'm sick of all this price drama and FUD. I'm going to BUIDL something that will change the world, like a decentralized app for ordering pizza with crypto."
"I went to this BUIDL meetup the other day, and it was like a gathering of the crypto Illuminati. Everybody there was way smarter than me and had already launched like 5 ICOs each."