To 'Boff the Mcfly out of', meaning to have sex with a girl so vigorously as to hopefully rememedy her poor taste in music.
1. Man: "I'm seeing this cool girl man, but she listens to terrible music!"

Friend: "Take her home and Boff the Mcfly out of her!"

2. Man: "So what happened last night man, did you Boff the Mcfly??"

Friend: "I Boffed the Mcfly out of her then i popped my bag of wheat crunchies all over her face! was fun times!"
by Ogami May 18, 2007

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