What does he mean by hook up?

I met a guy online, we met for a drink and it went ok, he is 45, I am 41. We both have kids. He invites me the ciniema and all went wrll. After I got home he texted me he wanted to kiss me but didn't. I said I'd of been ok with it. He then says he's horny. He sent be a text today saying we should hook up. I presuming he means have sex. I'm ok with casual as I understand when people have kids including myself it difficult to have a relationship. However I'm not one for being someone's option. How can I enthadize to him. Or should I just tell him to sod off?
What does he mean by hook up?
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