When a woman who is on her period farts, and it rolls up into her vagina, later to come out as a quief. As the quief occurs a clot of blood may be pushed out. This is known as quief butter.
1. Oh my gooodddd, my girlfriend just described the most awful phenomenon of female anatomy: quief butter!

2. Hey babe, I just want to let you know that I'm on the rag and I just rolled up a big ol' batch of quief butter!
by QueenQuief February 2, 2012
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