A catchphrase used when someone says a statement that is as true as 911.
Guy: Donald Trump is a fucking degenerate, racist cunt.
Another Guy: Dude, that's the truest shit since 911.
A statement that is used when another statement is made when it's as true as 911 occurring.
Person 1: I think if porn didn't exist, almost all women would be raped.
Person 2: Dude, that's the truest shit since 911.