The Twinkie, that spongy yellow cake filled with white faux frosting and unpronounceable ingredients has become an iconic symbol of processed foods because urban legend has it that it is the roach of snack foods (i.e., it cannot be destroyed).
--- Does it mean cockroach? So these cakes are cockroaches of snack foods?
Yes, "roach" is short for "cockroach".
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Newguestit is the roach of snack foods (i.e., it cannot be destroyed).
This relates to the urban legend that cockroaches can survive a nuclear explosion.