The sexual act of using peanut butter as lubricant for a frozen banana dildo. The male then eats out all of the peanutbutter from the woman's vagina by engaging in cunnilingus.
Guy 1: Dude, your mom offered me to peanutbutter and banana her.
Guy 2: But wait, she's allergic to peanuts!!!
I peanutbutter and bananaed my girlfriend last night and it tasted so good!
Peanutbutter and bananaing is a perfect way to get your daily dose of protein!