loco

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plumb loco

Rur. completely crazy. (Loco is from a Spanish word meaning "mad.") You're plumb loco if you think I'll go along with that. All those people were running around like they were plumb loco.
See also: loco, plumb

in loco parentis

  (formal)
to be responsible for a child while the child's parents are absent Teachers are in loco parentis while children are at school.
See also: loco

loco

(ˈloko)
mod. crazy. (From Spanish.) Who is that loco kid jumping up and down in the front seat?

plumb loco

(ˈpləm ˈloko)
mod. completely crazy. (Folksy. Loco is from a Spanish word meaning “mad.”) You’re plumb loco if you think I’ll go along with that.
See also: loco, plumb