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1 `B' TRAIN: A TRACTOR pulling two SEMI TRAILERS. The lead unit having a FIFTH WHEEL at the back to attach the second SEMI TRAILER or PUP. (For photo: See `RIG'.)  BACKHOE: A, farm tractor with an EXCAVATOR on the back, and, usually, a bucket, front end loader, on the front.
The short answer: Though this word was used in the 1500s to refer to sheep sounds, today b ae is used as a term of endearment, often referring to your boyfriend or girlfriend. Or perhaps a prospect who might one day hold such a lofty position.IME gives you a primer on slang that Pharrell likes enough to put in the titles of his songs.