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1.
Cuban slang for someone who is generally selfish, screws others over in order to get what he/she wants, and a son of a bitch.

Random: Don't use spanish words when you're talking in English. It sounds Mexican.
Ñooo ese tipo si que es un tremendo singao
by BornCuban93 August 21, 2009
 
2.
1. Cuban word, to imply that someone is a "mother fucker, "asshole," or a "bastard." It is the noun form of the cuban verb "singar," which means "to fuck." Vulgar. Also see Singa(f).
Spanish: Tu eres un singao!
English: You are a mother fucker!
by Cubanito10 February 02, 2010