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1.
A prase to be said to confuse people when asked if you are something derroghitory and/or bad
When asked if he was gay, Feir replied, "Only on Tuesdays."
by Chimp Chimp the Monkey Pimp June 18, 2004
 
2.
A term created by Isaih Porter. A stupid answer to a stupid question.
Are you stupid?

Only on Tuesdays.
by hanchotheduck April 24, 2011