"Don't even." is one of those sayings that you use when you're just -really- not in the mood, and basically it's telling someone that. No. Not really. It's actually more like: "Fuck off plz (:" But in a more.. polite way. It also can be short for: Don't even think about it.
"Haha. You remember that one time with Zach?"
exclamation, contraction of "don't even think about it", uttered during copulation with a frigid female that has just felt your cock brush her anus. A signal that you did not buy her enough alcohol prior to engaging in the sex act.
Oh yeah honey! How about some of this?
Damn.... hey you want a break? I make a mean vodka-lemonade.