HBD
An initialism of "Happy Birthday," used primarily in text messages and online communications. Hey, heard it's your birthday, Sarah. HBD! A: "Ah! My crush remembered my birthday!" B: "OK, I wouldn't get too excited—all he texted was 'HBD.'" HBD, girl! We need to get together and celebrate soon!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.