square / power or involution (math.) / upright / honest / fair and square / direction / side / party (to a contract, dispute etc) / place / method / prescription (medicine) / just when / only or just / classifier for square things / abbr. for square or cubic meter
(slang) Something awesome is about to happen! (originally, in a Japanese space battleship anime, it meant "Danger! High energy up ahead!" — a warning to either prepare for battle or take evasive action)