As far as I can tell it's about how each subgroup has it's own nomenclature and jargon. Something like how different regions will use the terms soda, or cola, or pop, or coke, or even fizzies in reference to carbonated beverages; or how some fields of work might have their own terminology (forceps, ampoule, scalpel, etc). Furthermore he postulates that there is a parent geek jargon which branches into specific subjargons as defined by familiary and occupation; and that capacity with the parent jargon is more beneficial in regards to inter-branch communications than knowing any one branch.
I don't know that there actual different 'geek lingos' though.