ba dionk-a-dionk - When you take a hand job and let it go all over something on

When you take a hand job and let it go all over something on purpose while still holding your meat.

I ba dionk-a-dionked on my mom's couch and she didn't even notice.

He ba dionk-a-dionked on the floor during class and got sent to the office.

I ba dionk-a-dionked on my brother's shirt and now he smells like a gym sock.