Used to describe someone who is bothersome, reluctant, and/or pessemistic.
as seen on family guy
Brian: You know just because you guys sung for some drunkards at a karaoke bar, doesn't mean you have talent.
Peter: Oh whatever Brian, you're just ants at a picnic.
Brian: I'm what? I'm ants at a picnic?
Brian: Yeah, ok... just wanted to make sure I heard that right.