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1.
One of Rallo descent who calls (sees) every bet placed in a Texas Hold em poker game, no matter what cards he holds in his hand.
<i> Callo </i> called my bet with a 3 high!
by Ryan Weiss October 22, 2004
 
2.
Spanish slang meaning very ugly person, normally used in a despective way applied to a female.
Tío, ¿cómo pudiste follarte a esa? ¡Pero si es un callo! - Dude, how could you fuck that girl? She's a minger!
by Trollmao August 01, 2010