like the back of a bus

like the back of a bus

Particularly ugly, unattractive, or sexually undesirable. Primarily heard in UK, Ireland. Many people in this profession still hold the view that if you don't have a face like the back of a bus, you're only getting ahead because of your looks. He looks like the back of a bus, but he's a really sweet and intelligent guy.
See also: back, bus, like, of
Farlex Dictionary of Idioms.

like the back of a bus

(of a face) very ugly. informal
2004 Waterford News and Star What's so great about a guy that has rotting teeth, lungs of tar and bless the poor bloke but the back of a bus does him fair enough justice.
See also: back, bus, like, of
Farlex Partner Idioms Dictionary
See also:
  • plug-ugly
  • ginger minger
  • esthetically challenged
  • aesthetically challenged
  • challenged
  • fugly
  • I don't fancy yours (much)
  • be (as) ugly as sin
  • pug-ugly
  • a bag-of-spanners face