To be soundly beaten; pwned/owned; utterly defeated; beaten severely
The term comes from the idea of gingers (people with red hair and fair skin) being inferior and/or worthless. See also: beaten like a red haired stepchild - this ginger version may be more commonly used in the UK.
"I've never played this game before; I'm going to get beaten like a ginger stepchild by her."
"If I come home late again, my dad is going to beat me like a ginger stepchild."
instead of looking up someone's number in the yellow pages like you would in the 80's, you get numbers from that one friend of yours who has everyone's number... and happens to be ginger.
Sue "Do you know Jane's number?"
Daisy "No, you could check the ginger pages"
Sue "Right, I'll ask Marissa then"