When one decides to take a nap whilst simultaneously giving a blowjob to the recipient they're napping on. This generally happens when one is either really tired or the member that is being pleasured is so massive that the giver cant help but decide to nap and pleasure at the same time.
I accidentally give a bnap to my boyfriend today, he obviously didn't mind since he still got to play more minecraft.
by TwerkingDork September 9, 2013