suctomer

The most pernicious and unfortunately, common, kind of customer, usually found frequenting retail environments for no other reason but to harass young and inexperienced, teen-aged employees. Sometimes found online badgering telemarketers for long periods, but in this case, their role is mutual as lower life forms.

Oh my God, dude, here comes that suctomer from last week who said I messed up his order but it was exactly what he ordered. He's not a customer; he's a suctomer!