loco

lo·co ¹  (lk)

adj. Slang

Mad; insane.

n. pl. lo·cos

1. See locoweed.

2. See loco disease.

tr.v. lo·coed, lo·co·ing, lo·cos

1. To poison with locoweed.

2. Slang To make insane; craze.

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[Spanish, crazy, possibly from Arabic lawq', foolish, feminine sing. of 'alwaq, from lqa, to soften; see lwq in Semitic roots.]

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lo·co ²  (lk)

adv. & adj. Music

At the pitch written. Used chiefly as a direction.

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[From Italian loco, from Latin loc, ablative of locus, place.]

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loco ¹

Noun

Informal a locomotive

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loco ²

Adjective

Slang, chiefly US insane [Spanish: crazy]

Thesaurus

Adj.

1.

loco - informal or slang terms for mentally irregular; "it used to drive my husband balmy" bats, batty, bonkers, buggy, crackers, daft, dotty, haywire, kookie, kooky, loony, around the bend, balmy, nuts, round the bend, wacky, whacky, nutty, barmy, loopy, fruity, cracked insane - afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter"