He stares at me all the time, he "unintentionally" runs into me/etc.

It kind of sounds like it but he may just be weird, it's hard to tell. Why not strike up a conersation with him?

Sounds like it, and since you are noticing all these things, sounds like you like him also

Well, he either likes you or he is a weird person. Talk to him.

I Need Advice?

Does This Mean He Fancies Me Or Something Because When He Sees Me He Hugs Me And Slaps My Arse?

W.b
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I think he is definitely interested in you!