Rapping

Rapping refers to spoken or chanted rhyming lyrics, which is often associated with hip hop music. The word has its' roots in 1960s African-American slang, which means "to converse."

When Noah Tall and Twisty were attempting to kidnap the Balunians from Marvin's backyard, Twisty asked how they are going to get the Krim family to get out of the flying saucer. Tall told him that as soon as they get rid of Robin (who was acting as their personal bodyguard), they would rap on the saucer. Twisty then asked him what they would rap about. He then tells him he meant "rap on it with out knuckles, you knothead!"