Spit blood/venom/feathers - Idioms by The Free Dictionary
To strongly express one's anger, typically verbally. Unless you want to get yelled at, stay away from the boss today—he's spitting blood over that printing mishap.
slang To be thirsty. Come on, man, I'm spitting feathers here—can't we stop for a drink?
spit blood be very angry. informal
spit feathers be very thirsty. informal
spit ˈblood/ˈvenom/ˈfeathers show that you are very angry; speak in an angry way: That man made me so angry that by the end of the meeting I was spitting blood!