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1.
the misspelling of the REAL word- ritardando. Retardando is not a slang or real word, just the way someone who has no knowlege of music would spell it.

Ritardando- To slow down the tempo. Used in Music scores to show a change in the tempo(speed) of the music.
You are a retard if you spell the word ritardando like retardando.
by DoubleXM June 13, 2007
 
2.
A retarded man, mainly applies to Mexicans.
You messed up again you stupid Mexican. Go hop back over the fence Retardando.
by more_cowbell_tiger July 07, 2011
 
3.
slang for retard,
stupid person
god kes, you are such a retardando!
by kookoo April 29, 2006