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1.
Something that comes for free or really cheap.
Word used in Romania, only makes sense in Romanian.
Guy : - Daca e moca, il luam...
Seller: - Numa' ma-ta e moca!
by DannyDaDogg February 09, 2010
 
2.
another term for weed
pass me the moca
pound of moca please
by gbiz November 25, 2004
 
3.
An abbreviation for "Man Of a Certain Age".

The phrase originated as the title of a TNT comedy-drama "Men of a Certain Age" from 2010 about three middle-aged men in their late 40's who are about to turn 50.

The abbreviation is mostly used by young gay men to describe an "older" gay man.
His boyfriend is a M.O.C.A.

This bar is good only after 10PM, when the MOCA's leave.
by HowieSnifter May 26, 2014
 
4.
the lovely feeling of being high, used for all sorts of drugs. each drug gives a different moca.

From Portuguese (yeah!)
freaking big moca man!
by pedros May 17, 2006