Someone who is not conventionally good-looking (or any kind of good-looking in some cases), but possesses an appealing personality, style, or talent, and is thus considered sexually attractive by many.

First coined by the movie, "Kissing Jessica Stein."
Adrian Brody, Ewan McGregor, Sarah Jessica Parker, and Mick Jagger are all sexy ugly. Mick Jagger is the example from the movie.
by kate321 March 13, 2006
One who is not really good looking, but exudes sex appeal. Thus making them fuckable.
by Jessy January 6, 2004
is the above poster insane?
uma thurman sexy ugly?
she is beyond sexy, apparently.
by q February 1, 2005
A person (usually male) who is not conventionally good-looking but who is, through their idiosyncracies, charisma, attitude or other mystery factor, sexually attractive.

A term popularised by the film Kissing Jessica Stein (2001).
Alan Rickman, Adrian Brody and Sean Penn could be considered sexy-ugly.
by KCRAUX April 14, 2013
A person generally not considered to be attractive by many, but who is hot as fuck.

Examples: Shia LaBeouf, Malcolm McDowell in 1971 A Clockwork Orange,
Girl 1: Hey I’m not gonna need a ride from you later, I’m going home with Mike.
Girl 2: How much have you had to drink?
Girl 1: No it’s not that. He really turns me on.
Girl 2: Really?
Girl 1: Yeah, I think he’s sexy-ugly and it’s gonna be hot as hell!
Girl 2: Ok, I can kinda see it. Have fun!
by Anunnakitty April 16, 2020
A person not conventionally good looking but something about them is so hot.
by streetsmarty February 14, 2014