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1.
Person so horrifyingly ugly that any normal looking person who dares even glance at them will become sick on sight. Only can be viewed by other uglos and whales See Amannda
von Anonymous 15. Juli 2003
 
2.
A mix between and ugly person and a lamo.
Me: Your such an uglo!
Little bro: YOU DONT THINK I KNOW THAT!
von pimptastic! 17. Januar 2008
 
3.
Male version of ugla, see ugla.
Kid 1: Give me your lunch money!
Kid 2: Hell no Uglo!
von sallaD:^) 6. Februar 2010
 
4.
Uglo - a combination of ugly and glow.

Someone so unattractive they glow in the dark. Even turning the lights off does not help.
Jack: Did you go home with Rachel last night?
Bubba: No ways bro, that girl is bona fide uglo!
von realname420 1. Dezember 2011