Advice regarding an awkward Facebook chat?

[Teddybear]

So this is how the conversation went:

Me: Hey
Him: Hello
Me: Are you going to _________ 18th?
Him: haven't heard about that
but ill ask him
he'll probs say yes
Me: im pretty sure ______ going, you should just ask for a plus one?
Cool dont reply then :L
Him: a plus 1 for what?
wtf calm down
Me: I was just kidding :L and a plus one for brennans 18th
Him: i havn't even been nvited yet
why wud i need a plus one?

And then I never replied. I know he's got an alternative sense of humour. I'm kind of a bit embarrassed and I have to see him first period tomorrow morning. I was thinking, ignore him and play hard to get until the party this weekend or...?

About a week ago he came to my friends drinks and we got talking and he started up a conversation. I remember standing in a large group but extremely close together, close enough that I could feel his hand brushing my thigh.

I'm honestly confused and embarrassed and don't usually consult people on the internet, so it's a first. I'm just feeling hopeless.

Essentially the question is, "Boy's, what does this mean!?"