Also see "Food Coma".
2. A word or sound made to signify food that looks, tastes, smells or otherwise seems delightful.
1. Person B: "Good job with those eggs Tim, best I've had in years."
2. "Yum, those muffins look great!"
However, in backward parts of the UK, there was once an Escort Cosworth which was registered with a numberplate which ended in these three letters... therefore, completely rationally, the car which had this numberplate was referred to as YUM, by fully grown adults.
Mate, can't adam'n'eve it, YUM never 'it 200mph today either boss... and when me old china parked up... we saw a small elderly gent chuckle before he was driven away in his big boostin white Saph Cossie? Ye get me?