I downvoted this because “xalbo” means “non-serious”. But nerds
can be quite serious about the stuff they do. This is true for geeks.

This opinion originally came from another IRC user but after I thought
about it agree with it.

crexalbo: expert/pro - levity
The definition of crexalbo as "geek/nerd" doesn't make sense in several
aspects
a) parsed from right to left (xalbo as head modified by certu) as with
tanru this word would result in "someone who uses levity whilst somehow
being expert of this using of levity" or an "expert of levity"
b) generally (for example at dictionary.com) a geek/nerd is an expert in a
narrow field, also the lack of social integration is included in this
definition. Someone who is an expert (probably executing the expert
activity with levity) would rather apply to some kind of natural talent or
so (I'd guess)