My teacher said something strange to me and I found it weird He said he wants my testicles in a toaster and I feel alarmed and threatened by this as it is a sexual remark?

It's most likely that your teacher was only using that as an expression, and it did not mean anything sexual at all. However, an expression like that is totally inappropriate for a teacher to use when talking to a student. Since it has alarmed you, you should tell your parents or maybe the counselor at school. Your parents or the counselor could talk to the teacher.