This is a shortened version of hot chocolate. Typically used by people who like to shorten words like social into 'soc'. People who use this term might come off like douchebags at first but are pretty cool people. Although the use of the word is meant to bother you it's kind of charming and grows on you; Just like the person who uses it.
Person: "What you got there, some hot cokes?"
Me: "ugh.. you know you sound like a d-bag when you say that, right?"
Me to me: I think I'm gonna miss him when he's gone.