To þorbjörga, or "thora" for short in english, means to start talking and flirting to a person and then have consensual sex with another person, or friend of said person, without their knowledge.

þorbjörga is a common Icelandic slang used in eastern Iceland. It is pronounced "thor-bjourga", "thora" for short.
"A friend of mine was þorbjörged(thored) by this chick the other day, I've been trying to cheer him up since."
or
"A friend of mine was þorbjörged(thored) by this dude the other day, I've been trying to cheer her up since."

"she/he is such a þorbjörga(thora), I can't believe her/him"
by Redbulltussa October 28, 2019
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