When you get rid of one pimple just to have three more pop up overnight to take its place. Often occurring before stressful days, like picture day or a first date.
"Dude, when'd you get all those whiteheads?"
"They're hydra pimples - I popped one last night, and now I have five!"
"They're hydra pimples - I popped one last night, and now I have five!"
by NoJo113 February 9, 2012