When the woman is on top during sex, bouncing or 'bobbing' up and down.

When you are falling asleep sitting up and your head bobs up and down, as if performing fellatio on a male.

an old, ugly, weird looking man that breanna wants to date.

When one repeatedly nods their head up and down (usually with their mouth open) in an attempt to stay awake, thus appearing to be giving a blow job.