A yanny is a word or phrase that is capable of distracting the entire internet for at least 24 hours. When you "drop a yanny," you start a contentious debate on some type of public forum.
Yannies usually cause an extremely intense but brief disagreement between opposing groups. This dispute might include the sense that adversaries are living on a completely alien planet, one where colors appear different and words, even when spoken in the same language, sound utterly unfamiliar. Yanny is derived from the Latin word yanerious meaning both "frenzy" and "word with many sounds." It shares a Greek root, daphne, with words including laurel.