The boss joked that he introduced me to work everywhere. Is this a hint that I quit?

Whether the boss hinted at your resignation or not, if you still want to work there, don't consider so many jobs. If he really wants to eat, does the boss imply that you quit? If you continue to want to work there, don't think so much about it, if one day he really wants to quit you. Guess is sometimes not so accurate, so don't guess. It may be a test of whether you can work here with peace of mind, or it may be a hint that you may resign. Since you don't understand, don't bother to think about it.