Someone who is
sober and hangs around
people who are drinking,
drunk, and/or under the influence of other substances, and tries to ruin their fun.
In certain cases the bober does not necessarily have to be sober.
(The word goes best in the phrase sober bober.)
Sam is such a
sober bober! He's been bobering us all
night. I just want to drink. I
don't want to hear about the consequences of my actions.