Filipino rice cake, sometimes used as a euphemism for the vagina because of their similar characteristics (texture, toppings, slits). Common toppings include "kesong puti" (white cheese, referencing cum-filled pussy) and "itlog na pula" (red salted eggs, referencing the testicles).
tl;dr, bibingka = pussy
Example double-entendre statement for bibingka vendors:
"Masarap ba 'yang bibingka mo?"