here today gone tomorrow here today gone tomorrow /hɪr təˈdeɪ ˈɡɔn təˈmɑːroʊ/

adjective

1. [Informal] Lasting a very short time  ( fugacious , transient , transitory , ephemeral , passing , short-lived , here today and gone tomorrow [Informal] , here today gone tomorrow [Informal] )
   lasting a very short time
    The ephemeral joys of childhood
   the ephemeral joys of childhood
    A passing fancy
   a passing fancy
    Youth's transient beauty
   youth's transient beauty
    Love is transitory but it is eternal
   love is transitory but it is eternal
    Fugacious blossoms
   fugacious blossoms