From Longman Dictionary of Contemporary Englishtailstailsa) [plural]DC a man’s jacket which is short at the front and divides into two long pieces at the back, worn to very formal events SYN tailcoat b) [uncountable]PEC spoken said when you are tossing a coin (=throwing it up in the air to decide which of two things you will do or choose) OPP heads → tail
Examples from the Corpus
tails• Which do you want, heads or tails? 