The lingering odor from an unpleasant experience, such as someone sticking their feet in your face or farting.
The smell equivalent of a bad aftertaste.
"Awww, your feet are so gross! There's even an after-whiff!"
The lingering malodorous scent of a meal, usually from combination of meat and strong-scented vegetables (onion, broccoli, brussel sprouts, etc.) and/or other seasonings. The odor is most often detected tends to permeate structures where the meal was prepared (e.g., kitchen, living room, bedroom). The smell can also be detected on a person's clothing or skin.
"My mom made pot roast three days ago and the house STILL has beef whiff."