When perspiration collects between your breasts leading to a foul odor. The scent often becomes pervasive, saturating your clothing leading to a readily discerned aroma.
Taylor: "I could have sworn you were going home with that guy last night, what happened?"
Izzy: "Girl, I had an immense case of Boobastank. That bar was too crowded and I haven't washed that bra for months."