"I wanted something different for a change. So I blew off KFC and went to a sushibar."
Is it OK to use "blow off" to mean that you didn't do something you were going to do?
OR
"If I hadn't blown off Physics this semester, I would have done well on the exam."
OR
"I wanted to kick in for the party but they blew me off."
Can I use it to say that I treated something as unimportant?

