Need help understanding the meaning of side hugs?

Anonymous
what do side hugs mean, I really need to know, some people say they are the same as full frontal hugs, but then some people say that they are just hugs given when you don't like that person so much and it's just being polite, I have a male friend who I have been friends with for years who sometimes gives me a full frontal hug but then sometimes gives me a side hug, what is the difference between the two and what is meant by each hug?

Updates
+1 y
even though we have been friends for years, him hugging me is a new thing, it's only started within the last year. and he never does it if there are other people around.
Need help understanding the meaning of side hugs?
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