Top Definition. kapish. kapish is formally spelled as capisce (pronounced as cah-peesh) which is derived from the italian word capire to understand and from latin capere to grasp or to seize. it is now used in american slang to say got it or understand..apish. kapish is formally spelled as capisce (pronounced as cah-peesh) which is derived from the italian word capire to understand and from latin capere to grasp or to seize. it is now used in american slang to say got it or understand..