macaroni
1. noun
1
an Italian-American or Italian. From the pasta product UK, 1845.
2
excrement. Rhyming slang for 'pony' (the reduced form of PONY AND TRAP), CRAP (excrement). Sometimes reduced to 'maca' UK, 1974.
3
a pony; hence £25. Rhyming slang for PONY UK, 1857.
4
in betting, odds of 25–1. From rhyming slang for PONY (£25) UK, 1991.
5
in oil drilling, small-diameter pipe US, 1954
2. verb
to defecate. Rhyming slang for PONY AND TRAP (CRAP) UK, 1974