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2.
DNO
DNO stands for Dudes Night Out. These occur once every 2-3 months. They usually occur when some bros just want to chill on a Sunday night. The DNO can start with a few beers and will end with what ever the best movie in theaters is. DNO's can not involve women in anyway what so ever.
Dude 1: Yo you know how we tried to have a DNO this weekend.
Dude 2: Ya why was it called off?

Dude 1: Because someone thought they would invite a chick.
Dude 2: Wow he would, I can't believe he ruined it.
by Brochacha69 November 04, 2010
 
1.
dno
dno is a shortened form of 'don't know'. it's often used in chatrooms or IRC
person 1: what are we going to do now?
person 2: hm.. dno
by aLer.r0x May 05, 2005
 
3.
DNO
Dummy Number One
You lost your keys? DNO...
by cleanhouse September 25, 2009