A word that stems from the phrase "k thx, bye" (and it's derivitives), which are bastardisations of "ok thanks bye".
This uttering is commonly associated with so-called IRC "lamers" (see lamer) renouned for the overuse of retarded abbreviations (such as the above) during chat sessions.
It is used extensively in IRC geek humour and in-jokes. See the example.
plz2b dieing, kthxbye
<martin> i r not on ipv6 KTHXBYE!!!!
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