Unpleasant, icky, bad-tasting, designed with bad taste, or just heinously ugly (esp. of females). Also has noun and verb forms. Example: Don't drink that beer--it's mingin'. OR, offensively: Yikes, she's nasty! That girl mings for England!
MINGIN'
Meaning of MINGIN' in English
Slang English vocab. Английский сленговый словарь. 2012