plug ugly
[noun]
Synonyms: tough, b'hoy, bullyboy, mucker, mug, roughneck, rowdy, ruffian, thug, yahoo

[TahlilGaran] English Synonym Dictionary ▲

plug-ugly adjective

1. very ugly
   Word Originby association with the verb plug in the informal sense ‘hit with the fist’.

[TahlilGaran] English Dictionary ▲