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1.
to have hot dirty sex with an undocumented alien, usually from the Latin America region
Hola bonita. Want to chaca chaca tonight?
by theoriginaljdog October 24, 2008
 
2.
Mexican slang term for sex.

Source: An Actual Mexican
Guy: * Sees hot babe* " Hey baby! Chaca chaca? "
by Tim_Tim_Da_Lax_Bro December 01, 2013
 
3.
Jerking off.
No mas chaca chaca...
by amazingone June 24, 2009