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1.
watch out, look out
Trucha.
by Mario August 28, 2003
 
2.
Literally "trout" in Spanish, it is also Spanish slang for "alert", or "vigilant". It was a combined with the word "Salvadorian" to form "Salvatrucha", as in Mara Salvatrucha, or the street gang MS13.

It is used as a warning, for example, similar to "heads-up".
Truchas! Cops are coming!
by merc142 May 09, 2006
 
3.
When a person is on the ball, meaning they're keeping track of their shit... always ready.
"Mira que trucha esa chola"
by MANIACO May 19, 2009
 
4.
Gay in Spanish slang.
Parece un poco trucha.
by rankete July 20, 2012
 
5.
In Argentina. Face.

Mira la trucha de ese tipo. Look at the fece of this guy.
by makato July 10, 2008