• qhat is someone on about?,
• ahat is someone on about?,
• shat is someone on about?,
• ehat is someone on about?,
• 3hat is someone on about?,
• 2hat is someone on about?,
• wgat is someone on about?,
• wbat is someone on about?,
• wnat is someone on about?,
• wjat is someone on about?,
• wuat is someone on about?,
• wyat is someone on about?,
• whzt is someone on about?,
• whst is someone on about?,
• whwt is someone on about?,
• whqt is someone on about?,
• whar is someone on about?,
• whaf is someone on about?,
• whag is someone on about?,
• whay is someone on about?

The adjective form of the phrase "what is someone on about?" would be "confusing" or "incomprehensible". This describes the state of being confused or not understanding someone's point or topic of discussion.