Rock climbing in Doc Martens? don't think so. maybe Rock The Holidays as in have a good time, party hardy.
Or just maybe it's a reference to Rock The Casbah?
The song gives a fabulist account of a ban on Western rock music by an Arab king. ... The pilots ignore the orders, and instead play rock music on their cockpit radios. The population then proceed to "rock the casbah" by dancing to the music.
Either way, stupid claims by stupid people, and yes I am stupid when it comes to rock climbing. 8>) Not something I ever desired to engage it, Unless it was rock climbing in a 4x4. 8>)