When two unattractive, weird, awkward, fat, etc. people are in a releationship of anykind.
Jessy: Ew look at monica and james kissing by room 201..
John: Daammmnn..thats some ugly love!
(n). - When someone is attracted to a person, that isn't typically found attractive, because that said someone feels like they don't deserve better.
Person 1: I'm really into John. I know he isn't that good looking though.
Person 2: That's ugly love.