Cascader

A cascader is a male who is not hygiene literate in that he does not know that he needs to clean in between his butt crack. Instead, assuming that soapy water cascading over his ass is enough to do the job. A worse variant of cascader will also neglect to pull back his foreskin to give the knob a clean. Males like this are the most likely reason that women hate giving head or rimjobs (because they can smell old poo poos wofting up from the booty hole and/or smegs). Neither parties of a straight couple has the awareness that men aren't supposed to smell that bad - unlike gay guys who usually learn early in life to clean that shit up. Although much rarer, females can also be cascader.