get this!

Từ điển Oxford Advanced Learner 8th

ˌget ˈthis! idiom
(informal, especially NAmE)used to say that you are going to tell sb sth that they will find surprising or interesting
•OK, get this guys— there are only two left!
•So get this— I did all the work and he got the money.
Main entry: ↑get_idiom