f'realio
A big, loud, and mostly fake way to say 'for real,' like when you're trying to sound cool but you're just being loud.
'You're telling me you skipped class again? F'realio! I'm so cool!', from a kid who's just trying to be popular.
'I got a 100 on the test? F'realio! I'm the best student ever!', from a text that's more of a flex than a fact.
'You said you'd come to the party? F'realio! I'm the only one here!', from a DM that's just a bunch of fake confidence.