In reality a person cannot blow off steam (the hot rising air from boiling water)—only electrical equipment can, such as the electric jug (appliance for boiling water for coffee). So what does it mean whe a person blows off steam? If you’re feeling angry, stressed or are experiencing some strong feelings and you want to get rid of them so you feel better again, you will blow off steam by doing something such as exercising to get rid of the stress.