moi, mooie, moey, mui [to rhyme with ‘boy’] noun
1 the mouth.
2 the face of a person 19-. Compare moy etymology: Romany mui ‘face mouth’; compare Hindi and Sanksrit mukha ‘mouth’; form moi attestesd by JS; forms moi, moey first attested in Kirk Yetholm and collected by Rev John Baird, Joseph F G S Lucas and Watson; forms mooie and mui attested by Galloway Tinkler-Gypsies; form mooie collected by Simson (1865) and attested by two of his informants; perhaps Shelta may ‘mouth’ is a development from this note:

Grellmann (1787) collected the forms Mui, Moi with the same meaning from Continental gipsies.

Smart & Crofton (1875) collected the form moói ‘mouth, face’ from English Gypsies.