Go All In
To go all in is to bet all of your remaining chips on a single hand.
The simple explanation
If you say 'all in' or push your whole stack forward, you put everything in the pot. You cannot lose more than that, and you cannot be asked for more.
A closer look
Going all in is a strong move, used with a very strong hand, with a good draw or as a bluff to make opponents fold. If the others have more chips, a side pot may be created. A player who is all in cannot act on later streets, but he still can win the part of the pot he has covered. Be sure of the rules: in most rooms, a verbal statement is binding.
A practical example
A player with $200 in front of him pushes all of his chips to the middle and says 'all in'.
Full explanation
To go all in is to bet all of your remaining chips on a single hand.
Go all in means to bet all your chips.
It can be value or a bluff.
A side pot may be created.
A verbal declaration is binding in most rooms.
Alternative spelling: Go All-In, Go Allin