Top Definition
Used when someone does/plans/talks about something a bit crazy. A lengthened version would be "What drug are you taking, to be high enough to do that". "What are you on" is usually followed up with "Do you want a list?" even if that person is not under the influence of drugs. N.B Used in Britain, less in America
Friend 1 : "I'm gonna jump off that cliff"
Friend 2 : "What are you on?"
Friend 1 : "Do you want a list?"
by TheRealPseudonym June 17, 2014
1 more definition
What are you doing
What are you going to be doing
What are you getting yourself to
What's up? Not much man just hanging out! What about you? What are you on?
by Googleinfo February 23, 2015

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