does “What did I say” means “did i say something weird?”

It can. When someone appears to be offended it’s a common tv trope for a person to reply “what did I say”. It can come across as genuine or aloof or dickish.

In general, “What did I say,” just means, “What were the words that came out of my mouth?” It can be used somewhat aggressively - if someone challenges - you to mean, “I meant what I said, why are you questioning me? You heard me. I was clear. You understood me.” It can also be used, when people around you are confused… To express surprise at yourself and doubt about what you may have said. In this sense, it could mean “Did I say something weird?” In this use, it’s usually a matter of context that gives what you said a different meaning than you had intended.

Depends on tone and context, but yes it can mean "did I say something weird?" It can also come up in situations where you think the other person misheard you, "what did I say?" then means "what do you think I said?" There are several not-quite-mean usages I can think of that are situations of people from "guess cultures" meeting people from "ask cultures". Short explanation, "guess" types tend to treat all requests as demands, act as though asking too often or for too much is offensive, but also think you'll be offended if they don't do what you ask as soon as you ask. "Ask" people tend to just ask casually, and if you can't do what they asked, that's fine. So if an "ask" person stays over at a "guess" persons house, the "ask" will tend to casually say "Oh, do you have vanilla coffee creamer?". The host then is afraid the guest will be horribly offended if they don't get that coffee creamer immediately, OR is offended that they dared to ask that when it is clearly impossible to get the coffee creamer before breakfast is served. Meanwhile the "ask" person is saying "everything is fine, no, it isn't any problem, this creamer is fine." If the host later expresses the opinion that the situation was somehow serious "What did I say? I said it was fine! I never said there was a problem with your coffee!"

Since the question was answered already, a quick note to keep in mind is that the question should be worded: Does “What did I say?” **mean** “Did I say something weird?” We don’t put an S on verbs after “does” because “does” is already conjugated for person: Does she *know* them? / He doesn’t *like* us. / It really does *snow* here a lot! Never would you say: ~~Does she knows them?~~ / ~~He doesn’t likes us.~~ / ~~It really does snows here a lot!~~ Similarly, we don’t put the main verb into the past tense when we use “did”: Did I miss something? NOT ~~Did I missed something?~~ / They didn’t know. NOT ~~They didn’t knew.~~ / We did ask you! NOT ~~We did asked you.~~ Auxiliary and modal verbs are never followed by fully conjugated main verbs. Usually the main verb is in the infinitive without “to”, just like it is with “do”. A couple exceptions exist (like “be”, “have”, and “get” for example), but most follow this rule. Never add an S or put it into the past tense.

It can mean “you seem offended- was it because of what I said?”