When they see the big D and freak out. This is the effect caused by seeing a very large penis, which usually causes the viewer's jaw to drop. This is most often seen with women on webcams, but also happens often at college parties. Freak cock effect has been the main source of many men getting laid. The one downside of a freak cock is that it is difficult for extremely well-endowed men to maintain stable personal relationships and receive gratifying oral sex.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.