Stop breathing my air is something you say to someone who is a complete waste of space. It is most commonly used when someone has said or done something unbelievably stupid.
Example:
"Yo, did you hear about that Hitler guy? Someone needs to stop him!"
(awkward silence)
"Stop breathing my air."
"Yo, did you hear about that Hitler guy? Someone needs to stop him!"
(awkward silence)
"Stop breathing my air."
by fairytales November 30, 2007