When a man ejaculates into his own bellybutton and leaves it to dry for an extended period of time. Once dried he then proceeds to eat it as a last resort snack.
Danny, after being stranded in the Sahara Desert, ate all 7 of his bellybutton croutons to satisfy his hunger.
A small brownish green growth that lies on the outer lips of a cheesy and yeast infected vaginal canal. Upon sitting for months, the growth hardens into a delicious and crunchycrouton. Often, when ripe, the crouton can be plucked for the beginnings of a prized collection. (Often dipped in MUNG for flavor).