Wiktionary
fly off the handle
vb. (context idiomatic English) to become very angry or enraged; to throw a fit or go crazy
WordNet
fly off the handle
v. get very angry and fly into a rage; "The professor combusted when the student didn't know the answer to a very elementary question"; "Spam makes me go ballistic" [syn: flip one's lid, blow up, throw a fit, hit the roof, hit the ceiling, have kittens, have a fit, combust, blow one's stack, flip one's wig, lose one's temper, blow a fuse, go ballistic]