The sound made, similar to a moan, but in an everyday situation. Coined by Kamden Dunphy an upcoming engineer. It's the sound that gets released when you're doing something that feels better than the best toe curling sex you've ever had.
Kamden- Eating Steak* Mmmmmmmmmmm!!!!
Sam- That was a nice fun grunt man, that steak must be really good.
Kamden- It's better than that time I slept with Minsu.