vulgar slang A person, typically a man, with naturally red hair. Primarily heard in UK, Ireland.

dated A rounded knob mounted to the steering wheel of an automobile so that it may be steered with one hand. So called because the driver (typically male) is able to place his arm around his girlfriend or wife. My grandfather gave me his old Cadillac, which still had the necker's knob on the wheel from when he first started courting my grandmother.

To interact with someone, typically someone who has more power, fame, or success than oneself. I can't hobnob with those ladies—they're executives at the biggest company in town!