Top definition
A hangover that is not evident upon waking up in the morning, but dominates your life two hours later.
At sunrise Joel bounced out of bed, gathered a crew up for brunch, sat down at the table, and proceeded to have his day destroyed by a ninja hangover that he had been harboring all along.
by chiTNR April 22, 2011
Get the mug
Get a Ninja Hangover mug for your girlfriend Helena.