The phrase "new boy" refers to someone who has recently joined or started something, like a school or job, and is still learning the ropes. Full definition
I do train new boys that would like to get started. (gaybdsmsingles.com)
It's not easy having green hair in conservative Kansas, but teenage Sprout manages while also prepping for the Kansas State Essay Contest and falling in love with the intriguing new boy in school. (booklistonline.com)
«Slaven Bilic is also under pressure at West Ham and is just 3/1 to go first with the Hammers hosting Premier League new boys Huddersfield at home whilst Rafa Benitez still seems on edge at Newcastle and a poor transfer window has done little to help him out. (thegamblingtimes.com)