Interjection. Early 19th century.
[Latin, literally 'seize the day!', a quotation from Horace (Odes i.xi).]
Used to urge someone to make the most of the present time and give little thought to the future.
Seize the day, coz YOLO, bro! I was all like "I'm gonna read the OED!" And they was all like "No way, dude!" And I was all like "Yes way, man! I am gonna carpe that flippin' diem! I am gonna memento that mori like a boss! I ain't gonna look before I leap. I ain't gonna think before I act. Consequences and repercussions are just a state of mind; and thinking ahead is backward thinking. And I am gonna express my individuality by having a stock Latin phrase tattooed on my body exactly like hundreds of thousands of other united non-conformists. Seize the day, dude - seize that flippin' day."
Why are you wasting time here thinking about commenting?
There are pints to be chugged, tattoos to inked, edges to be jumped off, and naked selfies to be sent.
Get out there dude! And regert nothing ...