It must be slang from East Los Angeles.

Question

Maybe it is cimo'

Answer 1

If you are having trouble with jerga (slang) here is a link that defines some of the different slang or substandard words of various Spanish speaking countries

jergas de habla hispana

As Gus has mentioned, Simón is meant as an affirmative like sí (note accent on both) and apparently it is used this way by the Spanish speaking people from/of Mexico, Salvador, Guatemala and Ecuador.

Answer 2

Please do not revive old out-of-date questions.

This question duplicates the one found here ---> Keemo

Leave these old turkeys to decay in the boneyard.

Moe

how is simón related to keemo? - Malenor, NOV 3, 2009

Hmm, after giving this some thought I realized they are second cousins twice removed. - Malenor, NOV 4, 2009

Answer 3

"Simón" is short for the enthusiastic rhyming expression, "¡Simón, Ramón!" But you won´t usually hear the full expression used anymore.

Answer 4

simon, might be simon, meaning si and in Englsih iit would be yes.