Green’s Dictionary of Slang

mullet n.2

also ape drape, hockey head, mud flap

a hairstyle, popularized in the 1970s; thus mulleteer n., a person with such a hairstyle.

[UK]Guardian Rev. 25 June 20: The mullet, the short top-and-long sides hairstyle popularised by – among others – Status Quo’s Rick Parfitt.
[UK]Indep. Rev. 17 Nov. 1: To those in the know it is referred to as the ‘mullet’. Also termed ‘the ape drape’, ‘the hockey head’ and ‘the mud flap’ [...] the style is characterised first and foremost by its bi-level design.
[UK]Guardian Guide 5–11 Feb. 5: Bespectacled, bearded, be-mulleted.
[UK]Guardian Editor 5 May 21: Shameful snaps of prize ‘mulleteers’ such as Lionel Ritchie.
[Aus]L. Redhead Rubdown [ebook] He wore coboy boots and a curly mullet.
[US]C. Carr Our Town 251: Most had that small-town Hoosier look — mullet haircuts, T-shirts, baseball caps.
[UK]Guardian 18 Dec. 38/4: Are there skeletons in his closet, or just mullet haircuts?
[UK]Times Mag. 30 Apr. 56/3: I’ve also got a ferociously Bothamesque mullet.
[Aus] 2 July [Internet] Became a dad at 16 and is fiercely proud of his mullet which he describes as ‘nice and filthy’.