Definition of 黒歴史 (くろれきし)
くろれきし
                        黒歴史
くろれきし
kurorekishi
noun
•
        
dark history, dark past, something one wants to forget or pretend never happened(Internet slang)
Related Kanji
| 黒 | black | 
| 歴 | curriculum, continuation, passage of time | 
| 史 | history, chronicle |