flim flar Share definition Flag founded by O'Reagan the second meaning under the weather, cant be botherd, also can be used in answers to questions. "Hey how are you today" "you know im just feeling abit flim flar" "oh right, wanna get some cookies to make you feel better" "sure sounds good" flim flar by P.Coley November 19, 2007 Get the flim flar mug.