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To be totally committed to something.

Possibly originating with gambling games such as Texas Hold 'em style poker, where the maximum 'raise' is to bet your full stack of chips.
If we're gonna do it, let's do it. I'm all in.
all in by Honor June 23, 2004
When you place all your eggs in one basket.
Jim: Yo John, how much money are you going to put in that stock
John: Hey buddy, I'm going all in by selling my wife, house, car and kids
Jim: Cool
all in by John Kennington February 8, 2021

all in a day's work 

*throws up plastic disc towards sky that breaks through the window of a terrorist suicide bomber plane and slices the terrorist's head off, leaving the pilot to safely land the plane*

All in a day's work.
all in a day's work by MegamanTTEX October 22, 2010

bullest shit in all the land

complete and utter absurdity.

something has happened that really pisses you off or you disagree with.
"did you see the score on that basketball game?"
"yea it was the bullest shit in all the land!"

all in the Kool Aid and don't even know the flava 

(adjective) referring to one who is spreading gossip of a false nature or a clueless individual.
Lotoya be ALL UP IN THE KOOL AID AND DON'T EVEN KNOW THE FLAVOR!

all in my feelings

to be upset or just to be very emotional
Jon: Yo Did you listen to Nothing Was The Same
Tyheem: Yeah I was all in my feelings