q and a mark
When someone says something dumb and they know it: Q & A Mark. It's the verbal equivalent of rolling eyes while muttering 'okay sure' under your breath.
Sarah calling her boss back at work about a vacation she can't take: Boss just gave me hell for asking - Sarah: q&amark
Dude tells a joke that kills in silence, guy across from him whispers the punchline. Everyone laughs except him and he gets up to leave before someone yells Q&A MARK.
@reddit_user142938056 (r/antiwork): 'managers are just lazy assholes who work less than us'. I reply: that's literally q&a mark behavior