The Boomer is one of the special infected in Valve's cooperative zombie shooter Left 4 Dead, first released in 2008, known for its bloated body and bile attack that attracts hordes. Its spawn cue has been lifted from gameplay and shared on soundboards, where editors often pair it with dramatic string music to heighten the joke. Because the character is instantly recognisable to players, even a few seconds of the growl signals a messy ambush ahead. That shorthand keeps it popular in gaming montages, reaction edits and horror-comedy videos years after the original release.