Misspelled version of "what", often intentionally typed as such and used as a response to something particularly confusing or bizarre. Originated as a misspelling of "whar", which itself is a misspelling of "what".
aqua: "hey can you help me with this math problem a sec"
ryo: "whar tne hel is ukw irhnu leae e alone inhabw a damily"
aqua: "hwar"