Smoking In

Everyone knows that if you're smoking pot, that's smoking out. BUT, if you're doing it inside, while STAYING IN, is that smoking IN? Like, if a stoner were to be propositioned by his fellow marijuana people, like "Dude, let's smoke out, brah," would he be remiss in saying "Nah man, I'm just gonna smoke in tonight, I'm not feelin' too good..."?