A Throw-Up is also called a throwie. It's a graffiti piece quick to paint, usually block lettering or rounded lettering with shadows. Usually they are one step to the right and one to the left. Train cars and delivery trucks are covered with them. Here, the writer risked falling two stories or more onto the stone banks of the Seine. This peice is located close to the Pont Notre-Dame just accros from the Marché au Fleurs on la Cité.
This is currently one of my favorite throwies in Paris. It can be seen from far. It's up on the back of a bouquiniste -- those book vendors lining the Seine's banks.
See how high the wall is? I took this photo on a different day. Paris is beautiful, n'est-ce pas?
Graffiti is one of the four creative mediums in the hip hop movement. Music, especially rap and turntablism are also part of it. I wonder if the graffer was thinking of Jason Derulo when he/she wrote BUBLE BUTT.
Here's the song. How many moblie phones use that whistle?