Rather than coming from one clearly credited film or show, this phrase circulates online as a short viral reaction clip, passed around on soundboards and in short-form edits where its blunt humour does the work. People search for the full phrase, let me smell your breath, when they want a quick, confrontational joke for a reaction or prank moment. Its staying power comes from how instantly recognisable the situation is: everyone has dodged an awkward close-up conversation, so the line lands without any setup or explanation.