“Boom, headshot” became widely known from the web series Pure Pwnage, where the character FPS Doug shouted it during exaggerated first-person shooter scenes in the mid-2000s. The quote spread through gaming forums, machinima videos and montage culture, then lived on in short meme edits and reaction clips. It is still used because the phrase instantly signals a clean sniper hit and adds old-school online gaming energy. It often appears alongside other iconic game callouts like Enemy Spotted.