The manic pixie dream boy (MPDB) is the male equivalent to the manic pixie dream girl. He tends to be gentle-natured, low testosterone and non-threatening, and looks like he's just stepped out of a boyband... indeed a lot of boybands are designed with that look in mind.
"The hashtag #manicpixiedreamboy has users retrospectively identifying the Manic Pixie Dream Boy in cinematic history (Ferris Bueller, Jack Dawson, Jesse from Pitch Perfect, Jacob from Crazy Stupid Love); arguing that we need more of them in current movies; and adding new names to the celebrity canon of Manic Pixie Dream Boys (notably, Hozier). " - Roisin Langan in Vice dot com
A strikingly attractive person, usually a male. Possibly from the 1936 hit song: When My Dream Boat Comes Home , in which a girl who transports a man to the land of joy.