if one is to commit a flap doodle, they would be flap doodling. Flap doodling is to participate in an act that your parents would not aprove of. i.e. sex, drugs, alcohol, wacking off etc.
"I will let you have your flap doodle now... but next time, let me be clear, there will be no flap doodling on my flap doodle time!"
A sexual maneuver in which, while doing a girl from behind, right as she's about to climax you yell "NIMOY HOY MINYOY YOY!" at the top of your lungs and plunge a pencil, eraser first, into her anus. Bonus points for a comically large pencil.
Why isn't Tom's new girlfriend talking to him right now?
Didn't you hear? He gave her the doodle bob.
The 'ol doodle bob, huh?