mod. crazy. (From Spanish.) : Who is that loco kid jumping up and down in the front seat?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
Cite This Source
Word Origin & History
loco
1844, Amer.Eng., from Sp. loco (adj.) "insane," of uncertain origin, perhaps from Arabic lauqa, fem. of 'alwaq "fool, crazy person." Loco-weed (1879) was name given to species of western U.S. plants that cause cattle and horse diseases that make them stagger and act strangely.