In response to people's lame "nerd backwards" definitions - If someone got called a dren, real nerds would take that as being called a shit. And real nerds are frelling awesome.
"Ugh, you really expect me to eat this dren?"
Defense Research and Engineering Network
Note: Dren came into use by through spelling the word nerd backwards. The word dern stemmed from a misspelling of this term.
"Don't be such a dren!"