esk. cello & bits Hanna Heitmann & Selektivton the urbandictionary.com about "esk": Spelled with a K for flare, the esk is a state of mind. It's a lifestyle lived by someone. It basically means anything can come out of your mouth at any given time no matter who's around or what the situation is. Esk moments can happen to others. If one did occur you might say that it was a "esk" moment.