{n. phr.} The two sides of a coin, especially when the coin is tossed in the air in order to decide which of two alternatives are to be followed. * /Tom tossed a quarter in the air and said, "Tails, I win; heads you win."/
HEADS OR TAILS
Meaning of HEADS OR TAILS in English
Slang English vocab. Английский сленговый словарь. 2012