The Gibson Special is a highly advanced sexual maneuver requiring extreme flexibility. Almost certainly dreamt up by a posh twat at Oxford/Cambridge University it involved the man tucking his legs behind his head whilst anally penetrating his fair maiden. The lady involved straddles the not-so-gentleman whilst leaning forward. The man then then proceeds to rock backwards and forwards on his spine for a maximum of sixty seconds before sustaining long term lower back damage. Oral can occur simulatenously.
Girl: "Hey. You disgust me. I would never like you in a million years."
Boy: "Shush. Come over. I'll give you The Gibson Special"
Hack the Gibson, is a phrase which originated from the movie Hackers, and is generaly used either with some degree of compliment to another person, or as a sarcastic term directed at those who request the steriotypical 'How to Hack' posts, usually an unskilled, unwilling to learn 'script kiddie'.
Positive: Man, that server was so locked down that it was like trying to Hack the Gibson.
Negative:
Script Kiddie: I wan7 70 b3 a 1337 h4x0r!11!! S0M3ONE T34CH ME TO HAX0R PLS!!111!!!