a) A car (usually on highway) constantly going over the speed limit, which you can follow so, in case traffic police with radar shows up, it gets caught and fined before you, allowing you to drive fast without getting a speeding ticket.
b) Rich man who gets women only because his fat wallet not his personal characteristics (looks, personality, etc.)
a) "See that BMW, who just passed us? Speed up and follow him, he will be our sponsor."
, look! Cathy is together with another fat, ugly bastard. Her previous sponsor must have run out of money!"