Mexcrement adjective 1noun 1forms 1 adjective1 •(slang, offensive) Mexican (of or relating to Mexico).I say the U.S. should also plant trees. They can be festooned with mexcrement wetbacks dangling by their scrawny necks. Should we call them Live Piñatas? — 2008 noun1 •(slang, offensive) A Mexican. formsMexcrements