dak
v. C2 Proficiency US //ˈdæk// UK //dˈæk// dak
v. to pull someone's trousers down quickly as a joke. It is a very informal word used mostly in Australia.
v. to pull down the trousers of another person, typically as a practical joke. Primarily used in Australian English; informal and often considered crude.
The boys tried to dak each other on the playground.
He was embarrassed when his friends decided to dak him in front of the whole group at the beach.
Usage
Transitive verb; requires a direct object, usually a person.