bownow
Slang for don't know.
Dude1: Yo dude what do you want to do today?
Dude2: Bownow... What do you want to do today?
Dude2: Bownow... What do you want to do today?
Bownow
The intro guitar notes in Fortunate Son by Creedence Clearwater Revival. Commonly associated with Vietnam war helicopters, primary the Bell UH-1 Iroquois. Australian slang for low level helicopter flight.
The low cloud ceiling forced the helicopters into Bownow, to maintain VFR separation.