Is a phrase to express "shock". When something unexpected happens and you need time to let it sink in. Similar to saying Wait, Pause, or Reconsider
*About to have sex*

Boy: Hold on baby let me get my condoms

Girl: No baby, you don't need one. I'm safe

Boy: Woah Dere!! I ain't trying to have no kids bitch
by Tony_Tr3 April 2, 2013
Get the Woah Dere mug.