The sound comes from a 2013 Geico television commercial in its Happier Than series, where a camel happily wanders an office asking coworkers what day it is. The joke builds on hump day, slang for Wednesday as the middle hump of the working week, and the camel's excited whoo whoot became the memorable punchline. The ad spread widely online, was shared again almost every Wednesday, and turned into a recurring meme for offices and classrooms. Its weekly relevance helped it stay in use long after the campaign ended.