That meshugge boy changed lanes on the highway without even looking!
From Yiddishמשוגע (meshuge, “crazy”), from Hebrewמְשׁוּגָּע (m'shugá, “crazy”), a form of שׁוּגַּע (shugá, “be driven mad”) and שִׁיגַּע (shigá, “drive mad”). First came into use in English around 1880.
English Wiktionary. Available under CC-BY-SA license.