Acronym used in sf fandom for Do Not Quote; see DNP. Something given to you with a DNQ attached means the information is for your eyes only and is not even to be talked about to your best friends.
Acronym for "I Love You, Dearly Not Queerly". What straight guys text each other when they've had a few. But also for friends (opposite sex or not, straight/bi/gay) in general.
Guy 1: Thanks dude. You're always there for me
Guy 2: Same here man!
Guy 1: ILY DNQ Guy 2 ILY2 DNQ
Girl: Get a room!