To be in a delicate situation; to be on the edge of danger or ruin.
An 'eggshell' is the thin, white outer coating of an egg. The shell is very thin and breaks easily. So if you are 'walking on eggshells' you are in a situation where you could breaksomething (or get in trouble or ruin everything) very easily.
Synonym: walking on thin ice
1) Ever since I smashed their car, I've been walking on eggshells with my parents.
2) We're walking on eggshells with our landlord -- she told us that if we have one more loud party, she's going to kick us out of our apartment.
When a bald or balding man, seemingly unaware of hair loss occurring on the top of his head, continues to grow out the hair on the sides and back of the head, thus ornamenting his barren follicles with a flowing skirt of, often disheveled, locks.
In his Frasier heydays, Kelsey Grammer sported the finest looking skirted eggshell
in the entertainment business.