Joking my ass - something so Preposterous that my ass isn’t confident with the premise. Therefore if Jacob says I done caught 5 alligator last night… Jacob your joking my ass!
Similar to No offense. It's usually said by a person after they've insulted you and meant everything they said, but don't want to upset you or get punched in the face as a result.
Mike: "Dude your a fucking faggot and no ones likes you! ...Haha only joking :)"
when a man says something to a man/gyal portraying it as a joke bc he ent confident enough to ask it for real. if they take it as a joke they act as if it was a joke the whole time, if they take it genuinely then they pretend they was serious or vice versa depending on which way advantages them.
as well as this the phrase can also be used if the opposite person knows what the phrase means
"I was hanging out with Kevin and Steve the other night. Kevin said something really odd to Steve, but Steve laughed hysterically. I guess Kevin was just inside joking."