dive a muff
vulgar slang To perform cunnilingus.
muff
vulgar slang A vulva.
muff (one's) lines
To forget or bungle the words that one is supposed to say, as in a speech or play. My mind went completely blank as soon as I stepped on stage, and I totally muffed my lines. I had learned the speech off by heart, but I was so emotional that I started muffing my lines about halfway through.
fluff one's lines
and blow one's lines; muff one's linesto speak one's speech badly or forget one's lines when one is in a play. The actress fluffed her lines badly in the last act. I was in a play once, and I muffed my lines over and over. It's okay to blow your lines in rehearsal.
dive a muff
tv. to perform oral sex on a woman. (Usually objectionable.) Tod likes to dive a muff every now and then.