1 definition by houseboyt

motorboat

a motorboat involves a girl with breasts large enough for a human head to fit between them. The owner of the head then proceeds to blow out of their mouth vibrating their lips. This action will make a sound very similar to a motorboat engine, hence the name.

guy leans into woman's breast and blows very hard...... then you have a motorboat

by houseboyt July 19, 2010