A quite Hilarious Term used commonly in poker, and sometimes used in real life situations for a good laugh. to be all in, is to show all your chips to the players at the table, to take A GIANT risk. With all your chips in, you could very well get your ass handed to you.
Hugh: Im all in, pocket twos.
Raymond: I'll raise your all in, with a 5, 8.
Gunthair: Im all in
Steven: What....? Hurry up and finish your dinner son
Gunthair: I'll show my bluff
Steven: Son, are you okay? Are you on drugs
Gunthair: Yeah I got a garbage hand, i'll fold.