Online Etymology Dictionary

The word “nightmare” (n.) comes from the late 13th century, originally meaning, “an evil female spirit afflicting sleepers with a feeling of suffocation,” compounded from the words night + mare “goblin that causes nightmares, incubus”.

The meaning of the word shifted during the middle of the 16th century from the incubus to the feeling of suffocation it creates. 

In the late 1820′s early 1830′s the word was first recorded to mean “any bad dream” and “very distressing experience”. 

Associated with the Dutch word, “nachtmare” and German word, “nachtmahr”. 

tum·blr (noun)

A microblogging platform and social networking website founded by David Karp and owned by Yahoo! Inc.[1]

a chiefly 20th century philosophical movement embracing diverse doctrines but centering on analysis of individual existence in an unfathomable universe and the plight of the individual who must assume ultimate responsibility for acts of free will without any certain knowledge of what is right or wrong or good or bad

Depends on what corner of tumblr you ask. There is a corner that argues white people have no culture to take, and one that argues you are only doing wrong if they culture has a history of be under oppression by white people.

In this corner you can wear a kimono or lederhosen. Although they are both cultural Icons from their country of origin, they don't hold a holy or earned value in those cultures. You can't erase meaning from something that didn't have it at the start. Even if these aren't exactly everyday items, they still aren't in the symbol stack of either culture.