It would be more usual to say 'meet up' in this situation. 'Let's meet up for lunch tomorrow'. 'Hook up with' suggests making contact, which isn't quite the same. I also believe it has a sexual connotation in US English, so it's probably wise to avoid that phrase.

they use this word mostely to get two things together you can say "let me see you in the lunch" lunch usually in 12:00 so you don't need to put the time or you can just say "how about lunch" for a suggestion

thanks everybody!!!!!!

It used to be possible to use "hook up" in British English in the sense you want, but we're now so familiar with the American usage that the sexual meaning has become dominant for us too.

As SuKi says, "hook up" means to meet and have sex in the US, at least in most situations. I'd avoid its use and use meet or another alternative