the smelly bubble of air surrounding someone who's farted
If we don't leave the table ASAP, we're gonna be stuck here sucking in Grandma's expanding fartwake.
the stinky wake surrounding someone's fart, in which the farter's unfortunate (or kinky) victim detects the smell; something like standing behind an airplane and detecting the wake of moving air, called prop wash
Don't follow right behind me now, or you'll end up in my fartwash.
a fart, or noisome gas passed from the same orifice as a Number Two
Dude, step away: I just deuced air! OR Damn: open a window! This car stinks of deuced air.