From shaga'; craziness -- furiously, madness.
see HEBREW shaga'
H7697. shiggaon
שִׁגָּעוֺן noun masculine madness; — בְּשׁ ׳הִכָּה Deuteronomy 28:28 smite with madness, figurative of wild and helpless panic ("" עִוָּרוֺן), לֵבָב תִּמְהוֺן, Zechariah 12:4 ("" תִּמָּהוֺן); ׳בְּשׁ 2 Kings 9:20 (hyperb.) madly.
שׁגר (√of following; compare Aramaic שְׁגַר cast, throw, Exodus 13:12 ᵑ7J drop young, misit, demisit (rare); compare DrDeuteronomy 7:13).