Can either be used to describe the act of having sex or smoking marijuana, easily confused and often awkward in conversations with people that don't know that there are two meanings
"Where's Kevin, isn't that his car?"
"Oh yea hes upstairs with jack doin the dirt."
"Wait, what? He's upstairs with jack... and he's doin..."
"No, no hes toking it up. yea they're definitely not getting freaky up there, or at least i'd hope not lol"