Wiktionary
calm your tits
alt. (context Internet slang idiomatic vulgar English) calm down! ((non-gloss definition: Used to tell someone to relax when they are agitated, angry, overexcited, etc.)) interj. (context Internet slang idiomatic vulgar English) calm down! ((non-gloss definition: Used to tell someone to relax when they are agitated, angry, overexcited, etc.))