have a fit 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}, {combust}, {blow one's stack}, {fly off the handle}, {flip one's wig}, {lose one's temper}, {blow a fuse}, {go ballistic}]