Mafia in this context is an organized group of flt attendants who use the high seniority of some coupled with a computer program to scour the swap boards, pickup trips, and broker them out to junior flt attendants for money...I've only heard all the stories, I have zero evidence.

Trip parking is where you move trips from your line to someone else's line so that you can pickup open time then you move the trips back. Normally it was done using swap with friends and only required two pilots to carry it out.