From describing personality:
Bubbly, outgoing with a great sense of humor. I’m willing to help anyone in need and when I’m in, I’m all in
when I'm in, I'm all in. What does it mean?
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I’m all in
is also used in a poker context. See all in:
2) Games staking all of one's chips, as in poker.
meaning the same as:
3) Putting all of one's available resources into an effort.