Boston Kreme Filling or B.K.F Is a term used either in text or verbally when talking about the insemination or fertilization of a woman or in other words when you "bust a nut"
Boy 1:"So Cassandra and i just found out we're having a baby, and honestly i regret giving her a Boston Kreme Filling now."
Boy 2:"Well it's safe to say that now you're the one who's fucked."
Boy 2:"Well it's safe to say that now you're the one who's fucked."
by Penisrekt June 29, 2016
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