Acronym for Mega Big Boy - the biggest sized condom made by the top condom manufacturer in Japan, Okamoto
MBB is considered to be the blessing gift from God to all the gaijin (foreigners) who struggle with finding condom that actually fits their mandingos in the Land of the rising sun.
MBB can also be used as slang or pet name for large penis
"Gurl, tell me all about it! How big is he?"
"Well, my throat is still pleasantly sore because of his MBB"
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