What is the full meaning of screwed?
having grooves like a screw; threaded. twisted; awry. Slang. bilked; cheated. Chiefly British Slang.
Why is screwed a bad word?
In this case, it is a less-vulgar version of saying “I’m fucked” or “He really fucked me”. It is using the relationship act as a metaphor for domination, which apparently is NEVER acceptable in polite company. … So bad that it would be as big a screw up as having intercourse with a dog.