Frantic and compuslive behaviour often associated with methamphetamine abuse (crank). People who regularly abuse crank may find themselves unable to stop a particular random activity like searching drawers, having sex, or putting things apart. This is called tweaking.
Repeatedly and obsessively engaging in a SIMPLE behavior or motion, like pulling at one's face to remove imagined objects that aren't there. Persons addicted to methamphetamine will engage in this type of compulsion. Yet, it is a myth some people subscribe to , that the behavior can extend to having sex. People high on meth can't perform anything NEARLY that complicated when they're tweaking, let alone maintain an erection or climax.