Some neeeew and fun Japanese words I have come across lately:
悲喜交々 = hiki komogomo = Bittersweet, having mingled feelings of joy and sorrow.
抗酸化物 = kousan kabutsu = antioxidant
自業自得 = jigou jitoku = you reap what you sow, you get what you deserve.
王道的 = oudouteki = principles of royalty, rule of right
致命傷 = chimeishou = critical wound
尿意 = nyuui = urge to urinate
拳 = kobushi = fist
Took this photo in Shinbashi Station: