Troglodite: The exact opposite of attractive in humans. Usually, extremely ugly men, (& occasionally women-or, whatever could be considered genitally of such a gender-male/female, anyone that dares to find out for sure) that troll/stalk free dating, & other social websites, in search of an attractive mate that they'd never have an ice cube's chance in Hell with. Some rare instances have proven that even physically attractive types can become these subhuman creatures after consuming too much alcohol, &/or drugs, or just happen to have a really horrid attitude. (See 'douchebag'.)
Go to any free dating site & scroll through photo profiles to see troglodites, or ask your friends what kinds of messages they've been receiving from strangers on facebook. You'll figure it out in less than 3 seconds, usually.