cap

one definition for the word cap is to shoot someone but most people
know it as the more current definitions which basically means that someone is lying so technically just a synonym for lying or a lie

jimmy: bro imma cap you if you don’t stfu
chris: alright jimmy calm down
or
jimmy: ayo chris david told me you were going on vacation to hawaii with everyone but didn’t invite me
chris: that’s cap i would never do that