A reflexive expression made by musicians and music lovers - particularly those involved in Black American music scenes (funk, jazz, hip hop, etc.) - to show appreciation for a particularly stanky (i.e. funky) beat, solo, riff or bassline.
Not the face made by white, suburban women whose cats have shat up the litter box. (See Taylor Jones' blog post...)
When I first heard Vulfpeck's "Funky Duck" the musician who put the recording on for me knew I liked it because of my reflexive stank face (not duck face!). -- Taylor Jones, 2016