Use English slang (I'm in) in a sentence?

Which one is correct if you want to accept a weekend plan, "Im in for this weekend" or "Im in this weekend"? or:Which one is correct if you want to ac

Which one is correct if you want to accept a weekend plan, "I'm in for this weekend" or "I'm in this weekend"?

or:Which one is correct if you want to accept a weekend plan, \"I'm in for this weekend\" or \"I'm in this weekend\"?

or:Either is acceptable.

or:I would do the second one but it would proably be better if you say count me in this weekend.

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