Literally: self – self – dark – show
Alternately: Self-suggestion. Working to convince yourself that something is true, or implant an idea, perception, or similar mental construct in one’s own head. This can range from self-hypnosis, to daily affirmations, to someone with crippling delusions trying to scream reality into the shape he wants. (The latter is not recommended.)
Notes: This is another compound of compounds; 自己 is “oneself,” while 暗示 is “to show or convey something indirectly,” “to hint.”
As always, replacing 己 with similar-looking characters such as 巳 (mi, the Chinese-zodiac sign for “snake”) or 已 (i, “stop,” “already”) is an error.
For the more positive kind, check out this relentlessly dorky video: