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Stands for facebook&jergens. It's kind of like a peanut butter and jelly, but instead of a sandwich, it's a term used for when you're in the mood to plow and want to bang a specific person but you're held back by relationship commitments so you just look at their most provocative profile pics and please yourself in order to release the urge to take them to pound town. This definition is often used by distraught individuals that have had more than five drinks or have just received a text message from a love interest after they have secured their position in a monogamous relationship.
Bob: I just received a text from Amanda

Theodore: oh man, didn't you always have a thing for her?

Bob: yeah, but I'm in a relationship with chloe

Theodore: are you going to cheat on her

Bob: no, I'm just going to FB&J
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