In GTA

"In GTA" is a phrase said usually after a "Fed post" (Anything posted online that shows conspiring or premeditated planning of criminal activity. ) and it usually means "This is a joke" to the FBI Agents watching on screen.

1st person : "I'm going to send pipe bombs to your IRL house In GTA"

2nd person : " Oh haha me too in GTA!"

FBI : "Oh alright they're just making silly jokes on the internet, leave him alone boys"

OR

1st person : "I'm boutta bomb this whole mf plane"

2nd person :" Damn bro can i help?"

Both persons : "In GTA!"

FBI : "Had me in the first half ngl, they good"