1) Beatle-like hairstyle 2) Beatle, endearingly 3) Indie do 
The mop top is a haircut popularised by the Beatles during the 1960s, who were in turn introduced to it by a German part-time hairdresser, Astrid Kirchherr, who adapted it from the French Caesar cut. The mop top is a straight cut with a straight fringe, no grease, and the hair over the ears.Mop-top is slang for someone with long, untidy hair.