an adjective. Used to describe someone who only wants to know you when they want something - other than that you never hear from them.
Renee is such a sometimey bitch. I haven't talked to her in two months, but now she wants to borrow my car!
by winnie123 August 02, 2008
Very moody. Happy one minute, upset the next.
Andrew has been acting sometimey lately.
by PriceLess June 21, 2007