Assholetep is "An aeons old automaton king... with the petulant impatience and obnoxious tantrums of a 7 year old child.", its a Warhammer 40K character created by /tg/. I picked the name because I think it is funny and I don't want my usual username permutations to appear on a hentai forum.
Long answer: Before "Daktyl" I had various different names across different things. I was reading a book one day that included a demon "Dactyl". I replaced the C with a K when I created my next account (some online game) and I fell in love. I've been using it ever since.