1 definition by Matt Post

A sexual act, either perversive or naive, when the penis is placed in the belly button of a female when the assumed intent of the female party is vaginal pleasure. This can cause either amusement, discomfort, or general displeasure.
"Damn, it, Kenny! If you don't stop Flanagan my belly button, I will have to ask for my camera back!"
by Matt Post March 8, 2008
Get the flanagan mug.