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てか teka
Anyway — new subject.
What does teka mean?
Squashed down from というか. It jumps the conversation sideways, either to correct what you just said or to change the topic entirely.
Example
てか、明日の集合何時だっけ?
Anyway, what time are we meeting tomorrow?
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind teka
Track it backwards and you get というか, a joint for correcting yourself mid-sentence, worn down through ってか to てか. That erosion is normal in Japanese; what happened next is the interesting part. A connector that belonged mid-sentence got promoted to the front of one.
Once it sits at the start it stops joining and starts steering. てか announces a swerve, either back over what you just said or straight into a new topic, without any of the apparatus a polite topic change would require. The longer form was mocked as sloppy youth speech decades ago. The short one is now simply how conversation turns.