So, creeped isn't entirely a word, crept is. But "I am getting crept out," doesn't make much sense and sounds awful Could I use the word creeped? Or do I have to use crept?
In dialogue, that's prefectly fine I think. For some reason, I'm thinking creeped refers to the feeling people have about something and crept refers to the motion.
"I'm getting creeped out." "I'm getting crept out." sounds like a leopard is about to pounce on you. 'Course, "This is freaking me out." would be better.
Actually, used like that, the expression "creeped out" is a slang expression like "weird s.one out", and not in the corpus of formal English. However, if you want to have it, since it is an American expression, it would be spelt with US spelling "creeped". British English uses "crept" as past tense for the verb "creep" (and "spelt" instead of "spelled" also).
This reminds me of the tongue twister: The cat crept into the crypt, crapped then crepted out. Sorry couldn't resist it. answer: I'm getting creeped out. 'Creeped out is an older saying, but 'freaked out' is more modern, your choice, also it depends on the context.
"Crept" is grammatically correct. But the expression is "creeped out." If a character is using it in dialogue, go ahead and use "creeped out."
