When a male animal's, usu. human's, flaccid penis is struck by the outside extremity of someone else's finger ("flicked") for reasons other than sexual (i.e recreation, revenge, etc.). A synonim is "dick flick".
I believe you will suffer from a ba-dong, since you drank all the beer I bought.
The sound of a large penis being unleashed from the pants.
John Holmes enteed the room and with a thunderous Ba-Dong the hores fell over with their legs in the air!
Bad and wrong, adj. Bad/wrong..aweful
Billy's erectile disfunction put him in a situation of ba-dong feelings and pipe dreams.
A Ba-dong-a-dong is a sexual slur that has risen in the past few years and has spread to various parts of the USA.
In singular form (Ba-dong-a-dong), it is referencing a penis.
In plular form (Ba-dong-a-dongs), it is referencing either just the balls, or the "whole set".
Dude, when I saw her, my Ba-dong-a-dong went huge!