When you're walking/riding/driving so slow that you get aggraveted by the situation,
so you say "I'm speeding like a plum!". Since plums can't speed at all the direct meaning is contrasted in a
sarcastic definition, emphasized as going so slow, almost stopping.
(carrying Corey in the bike)
Corey: Hurry up Tim! We're late for the
soccer game!
Tim: I can't! I'm doing
the best I can but You're too heavy.. we are
speeding like a plum!