Alakefik
I think there's an explanation of the term somewhere in George MacDonald Fraser's McAuslan books (McAuslan in the Rough, The General Danced at Dawn or The Sheik and the Dustbin). His understanding was undoubtedly informed by his own service in Libya. I've not read them for a while (they're too funny to bear more than once a decade) but, if I recall correctly, MacDonald Fraser suggests it means 'can't be bothered'.