When a girl does not take a shower and especially does not wash her vagina. She then procedes to sit on the face of the male and moves in all directions making the nose of the male ride up even farther into the crouch of the female. To simulate like riding a bicycle, when the bike seat is the males face.
"Yeah my girlfriend gave me an Interstate Bicycle last night and i almost threw up"
Guy: I am not letting you trick me into a Interstate Bicycle again. you better wash that thing again.