1. a. An exclamatory phrase conveying sentiments of astonishment, surprise, anger, annoyance, bewilderment or other general feelings of shock. Should be spoken with great emphasis.
Not directly related to the act of smearing shit on or having shit smeared on the tits, but rather the emotions equivalent to the feeling of shock upon realizing shit is on the tits.
Amber and adam leaving holiday we then realize holy shit tits I'm suppose to be at work and it's brrrr cold out!!!thus meaning it's also cold and rainy and we're late!!! Brrrr